{"trustable":true,"sections":[{"title":"","value":{"format":"HTML","content":"\u003cdiv class\u003d\"challenge_problem_statement\"\u003e\u003cdiv class\u003d\"msB challenge_problem_statement_body\"\u003e\u003cdiv class\u003d\"hackdown-content\"\u003e\u003cstyle id\u003d\"MathJax_SVG_styles\"\u003e.MathJax_SVG_Display {text-align: center; margin: 1em 0em; position: relative; display: block!important; text-indent: 0; max-width: none; max-height: none; min-width: 0; min-height: 0; width: 100%}\n.MathJax_SVG .MJX-monospace {font-family: monospace}\n.MathJax_SVG .MJX-sans-serif {font-family: sans-serif}\n.MathJax_SVG {display: inline; font-style: normal; font-weight: normal; line-height: normal; font-size: 100%; font-size-adjust: none; text-indent: 0; text-align: left; text-transform: none; letter-spacing: normal; word-spacing: normal; word-wrap: normal; white-space: nowrap; float: none; direction: ltr; max-width: none; max-height: none; min-width: 0; min-height: 0; border: 0; padding: 0; margin: 0}\n.MathJax_SVG * {transition: none; -webkit-transition: none; -moz-transition: none; -ms-transition: none; -o-transition: none}\n.mjx-svg-href {fill: blue; stroke: blue}\n\u003c/style\u003e\u003csvg style\u003d\"display: none;\"\u003e\u003cdefs id\u003d\"MathJax_SVG_glyphs\"\u003e\u003c/defs\u003e\u003c/svg\u003e\u003cp\u003e\u003cstrong\u003eObjective\u003c/strong\u003e \u003cbr\u003e\nIn this challenge, we practice using the \u003cem\u003eawk\u003c/em\u003e command or a shell script to detect palindromes.\u003c/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eTask\u003c/strong\u003e \u003cbr\u003e\nYou are given a list of words with each word on a new line. Each word contains only lowercase letters (\u003cspan style\u003d\"font-size: 100%; display: inline-block;\" class\u003d\"MathJax_SVG\" id\u003d\"MathJax-Element-1-Frame\"\u003e\u003csvg xmlns:xlink\u003d\"http://www.w3.org/1999/xlink\" width\u003d\"5.158ex\" height\u003d\"1.676ex\" style\u003d\"vertical-align: -0.338ex;\" viewBox\u003d\"0 -576.1 2220.9 721.6\" role\u003d\"img\" focusable\u003d\"false\"\u003e\u003cg stroke\u003d\"currentColor\" fill\u003d\"currentColor\" stroke-width\u003d\"0\" transform\u003d\"matrix(1 0 0 -1 0 0)\"\u003e\u003cpath stroke-width\u003d\"1\" d\u003d\"M33 157Q33 258 109 349T280 441Q331 441 370 392Q386 422 416 422Q429 422 439 414T449 394Q449 381 412 234T374 68Q374 43 381 35T402 26Q411 27 422 35Q443 55 463 131Q469 151 473 152Q475 153 483 153H487Q506 153 506 144Q506 138 501 117T481 63T449 13Q436 0 417 -8Q409 -10 393 -10Q359 -10 336 5T306 36L300 51Q299 52 296 50Q294 48 292 46Q233 -10 172 -10Q117 -10 75 30T33 157ZM351 328Q351 334 346 350T323 385T277 405Q242 405 210 374T160 293Q131 214 119 129Q119 126 119 118T118 106Q118 61 136 44T179 26Q217 26 254 59T298 110Q300 114 325 217T351 328Z\"\u003e\u003c/path\u003e\u003cg transform\u003d\"translate(751,0)\"\u003e\u003cpath stroke-width\u003d\"1\" d\u003d\"M84 237T84 250T98 270H679Q694 262 694 250T679 230H98Q84 237 84 250Z\"\u003e\u003c/path\u003e\u003c/g\u003e\u003cg transform\u003d\"translate(1752,0)\"\u003e\u003cpath stroke-width\u003d\"1\" d\u003d\"M347 338Q337 338 294 349T231 360Q211 360 197 356T174 346T162 335T155 324L153 320Q150 317 138 317Q117 317 117 325Q117 330 120 339Q133 378 163 406T229 440Q241 442 246 442Q271 442 291 425T329 392T367 375Q389 375 411 408T434 441Q435 442 449 442H462Q468 436 468 434Q468 430 463 420T449 399T432 377T418 358L411 349Q368 298 275 214T160 106L148 94L163 93Q185 93 227 82T290 71Q328 71 360 90T402 140Q406 149 409 151T424 153Q443 153 443 143Q443 138 442 134Q425 72 376 31T278 -11Q252 -11 232 6T193 40T155 57Q111 57 76 -3Q70 -11 59 -11H54H41Q35 -5 35 -2Q35 13 93 84Q132 129 225 214T340 322Q352 338 347 338Z\"\u003e\u003c/path\u003e\u003c/g\u003e\u003c/g\u003e\u003c/svg\u003e\u003c/span\u003e). Your task is to write a program to display only those words that are palindromes. Palindromes are strings that read the same when reversed.\u003c/p\u003e\u003c/div\u003e\u003c/div\u003e\u003c/div\u003e\u003cdiv class\u003d\"challenge_input_format\"\u003e\u003cdiv class\u003d\"msB challenge_input_format_title\"\u003e\u003cp\u003e\u003cstrong\u003eInput Format\u003c/strong\u003e\u003c/p\u003e\u003c/div\u003e\u003cdiv class\u003d\"msB challenge_input_format_body\"\u003e\u003cdiv class\u003d\"hackdown-content\"\u003e\u003cstyle id\u003d\"MathJax_SVG_styles\"\u003e.MathJax_SVG_Display {text-align: center; margin: 1em 0em; position: relative; display: block!important; text-indent: 0; max-width: none; max-height: none; min-width: 0; min-height: 0; width: 100%}\n.MathJax_SVG .MJX-monospace {font-family: monospace}\n.MathJax_SVG .MJX-sans-serif {font-family: sans-serif}\n.MathJax_SVG {display: inline; font-style: normal; font-weight: normal; line-height: normal; font-size: 100%; font-size-adjust: none; text-indent: 0; text-align: left; text-transform: none; letter-spacing: normal; word-spacing: normal; word-wrap: normal; white-space: nowrap; float: none; direction: ltr; max-width: none; max-height: none; min-width: 0; min-height: 0; border: 0; padding: 0; margin: 0}\n.MathJax_SVG * {transition: none; -webkit-transition: none; -moz-transition: none; -ms-transition: none; -o-transition: none}\n.mjx-svg-href {fill: blue; stroke: blue}\n\u003c/style\u003e\u003csvg style\u003d\"display: none;\"\u003e\u003cdefs id\u003d\"MathJax_SVG_glyphs\"\u003e\u003c/defs\u003e\u003c/svg\u003e\u003cp\u003eThe input format consists of a list of words, each on a new line. The words will only contain lowercase letters (\u003cspan style\u003d\"font-size: 100%; display: inline-block;\" class\u003d\"MathJax_SVG\" id\u003d\"MathJax-Element-1-Frame\"\u003e\u003csvg xmlns:xlink\u003d\"http://www.w3.org/1999/xlink\" width\u003d\"5.158ex\" height\u003d\"1.676ex\" style\u003d\"vertical-align: -0.338ex;\" viewBox\u003d\"0 -576.1 2220.9 721.6\" role\u003d\"img\" focusable\u003d\"false\"\u003e\u003cg stroke\u003d\"currentColor\" fill\u003d\"currentColor\" stroke-width\u003d\"0\" transform\u003d\"matrix(1 0 0 -1 0 0)\"\u003e\u003cpath stroke-width\u003d\"1\" d\u003d\"M33 157Q33 258 109 349T280 441Q331 441 370 392Q386 422 416 422Q429 422 439 414T449 394Q449 381 412 234T374 68Q374 43 381 35T402 26Q411 27 422 35Q443 55 463 131Q469 151 473 152Q475 153 483 153H487Q506 153 506 144Q506 138 501 117T481 63T449 13Q436 0 417 -8Q409 -10 393 -10Q359 -10 336 5T306 36L300 51Q299 52 296 50Q294 48 292 46Q233 -10 172 -10Q117 -10 75 30T33 157ZM351 328Q351 334 346 350T323 385T277 405Q242 405 210 374T160 293Q131 214 119 129Q119 126 119 118T118 106Q118 61 136 44T179 26Q217 26 254 59T298 110Q300 114 325 217T351 328Z\"\u003e\u003c/path\u003e\u003cg transform\u003d\"translate(751,0)\"\u003e\u003cpath stroke-width\u003d\"1\" d\u003d\"M84 237T84 250T98 270H679Q694 262 694 250T679 230H98Q84 237 84 250Z\"\u003e\u003c/path\u003e\u003c/g\u003e\u003cg transform\u003d\"translate(1752,0)\"\u003e\u003cpath stroke-width\u003d\"1\" d\u003d\"M347 338Q337 338 294 349T231 360Q211 360 197 356T174 346T162 335T155 324L153 320Q150 317 138 317Q117 317 117 325Q117 330 120 339Q133 378 163 406T229 440Q241 442 246 442Q271 442 291 425T329 392T367 375Q389 375 411 408T434 441Q435 442 449 442H462Q468 436 468 434Q468 430 463 420T449 399T432 377T418 358L411 349Q368 298 275 214T160 106L148 94L163 93Q185 93 227 82T290 71Q328 71 360 90T402 140Q406 149 409 151T424 153Q443 153 443 143Q443 138 442 134Q425 72 376 31T278 -11Q252 -11 232 6T193 40T155 57Q111 57 76 -3Q70 -11 59 -11H54H41Q35 -5 35 -2Q35 13 93 84Q132 129 225 214T340 322Q352 338 347 338Z\"\u003e\u003c/path\u003e\u003c/g\u003e\u003c/g\u003e\u003c/svg\u003e\u003c/span\u003e). \u003c/p\u003e\u003c/div\u003e\u003c/div\u003e\u003c/div\u003e\u003cdiv class\u003d\"challenge_output_format\"\u003e\u003cdiv class\u003d\"msB challenge_output_format_title\"\u003e\u003cp\u003e\u003cstrong\u003eOutput Format\u003c/strong\u003e\u003c/p\u003e\u003c/div\u003e\u003cdiv class\u003d\"msB challenge_output_format_body\"\u003e\u003cdiv class\u003d\"hackdown-content\"\u003e\u003cstyle id\u003d\"MathJax_SVG_styles\"\u003e.MathJax_SVG_Display {text-align: center; margin: 1em 0em; position: relative; display: block!important; text-indent: 0; max-width: none; max-height: none; min-width: 0; min-height: 0; width: 100%}\n.MathJax_SVG .MJX-monospace {font-family: monospace}\n.MathJax_SVG .MJX-sans-serif {font-family: sans-serif}\n.MathJax_SVG {display: inline; font-style: normal; font-weight: normal; line-height: normal; font-size: 100%; font-size-adjust: none; text-indent: 0; text-align: left; text-transform: none; letter-spacing: normal; word-spacing: normal; word-wrap: normal; white-space: nowrap; float: none; direction: ltr; max-width: none; max-height: none; min-width: 0; min-height: 0; border: 0; padding: 0; margin: 0}\n.MathJax_SVG * {transition: none; -webkit-transition: none; -moz-transition: none; -ms-transition: none; -o-transition: none}\n.mjx-svg-href {fill: blue; stroke: blue}\n\u003c/style\u003e\u003csvg style\u003d\"display: none;\"\u003e\u003cdefs id\u003d\"MathJax_SVG_glyphs\"\u003e\u003c/defs\u003e\u003c/svg\u003e\u003cp\u003eOutput only the palindromes from the original list of words. Their ordering should be the same as in the original list. \u003c/p\u003e\u003c/div\u003e\u003c/div\u003e\u003c/div\u003e\u003cdiv\u003e\u003ctable class\u003d\"vjudge_sample\"\u003e\n\u003cthead\u003e\n \u003ctr\u003e\n \u003cth\u003eInput\u003c/th\u003e\n \u003cth\u003eOutput\u003c/th\u003e\n \u003c/tr\u003e\n\u003c/thead\u003e\n\u003ctbody\u003e\n \u003ctr\u003e\n \u003ctd\u003e\u003cpre\u003etest\ntoy\nbob\nbil\ncow\nnoon\n\u003c/pre\u003e\u003c/td\u003e\n \u003ctd\u003e\u003cpre\u003ebob\nnoon\u003c/pre\u003e\u003c/td\u003e\n \u003c/tr\u003e\n\u003c/tbody\u003e\n\u003c/table\u003e\n\u003c/div\u003e\u003cdiv class\u003d\"challenge_explanation\"\u003e\u003cdiv class\u003d\"msB challenge_explanation_title\"\u003e\u003cp\u003e\u003cstrong\u003eExplanation\u003c/strong\u003e\u003c/p\u003e\u003c/div\u003e\u003cdiv class\u003d\"msB challenge_explanation_body\"\u003e\u003cdiv class\u003d\"hackdown-content\"\u003e\u003cstyle id\u003d\"MathJax_SVG_styles\"\u003e.MathJax_SVG_Display {text-align: center; margin: 1em 0em; position: relative; display: block!important; text-indent: 0; max-width: none; max-height: none; min-width: 0; min-height: 0; width: 100%}\n.MathJax_SVG .MJX-monospace {font-family: monospace}\n.MathJax_SVG .MJX-sans-serif {font-family: sans-serif}\n.MathJax_SVG {display: inline; font-style: normal; font-weight: normal; line-height: normal; font-size: 100%; font-size-adjust: none; text-indent: 0; text-align: left; text-transform: none; letter-spacing: normal; word-spacing: normal; word-wrap: normal; white-space: nowrap; float: none; direction: ltr; max-width: none; max-height: none; min-width: 0; min-height: 0; border: 0; padding: 0; margin: 0}\n.MathJax_SVG * {transition: none; -webkit-transition: none; -moz-transition: none; -ms-transition: none; -o-transition: none}\n.mjx-svg-href {fill: blue; stroke: blue}\n\u003c/style\u003e\u003csvg style\u003d\"display: none;\"\u003e\u003cdefs id\u003d\"MathJax_SVG_glyphs\"\u003e\u003c/defs\u003e\u003c/svg\u003e\u003cp\u003eWe have filtered the list to display only the palindromes. \u003c/p\u003e\u003c/div\u003e\u003c/div\u003e\u003c/div\u003e"}}]}