{"trustable":true,"prependHtml":"\u003cstyle type\u003d\u0027text/css\u0027\u003e\n .input, .output {\n border: 1px solid #888888;\n }\n .output {\n margin-bottom: 1em;\n position: relative;\n top: -1px;\n }\n .output pre, .input pre {\n background-color: #EFEFEF;\n line-height: 1.25em;\n margin: 0;\n padding: 0.25em;\n }\n \u003c/style\u003e\n \u003clink rel\u003d\"stylesheet\" href\u003d\"//codeforces.org/s/96598/css/problem-statement.css\" type\u003d\"text/css\" /\u003e\u003cscript\u003e window.katexOptions \u003d { disable: true }; \u003c/script\u003e\n\u003cscript type\u003d\"text/x-mathjax-config\"\u003e\n MathJax.Hub.Config({\n tex2jax: {\n inlineMath: [[\u0027$$$\u0027,\u0027$$$\u0027], [\u0027$\u0027,\u0027$\u0027]],\n displayMath: [[\u0027$$$$$$\u0027,\u0027$$$$$$\u0027], [\u0027$$\u0027,\u0027$$\u0027]]\n }\n });\n\u003c/script\u003e\n\u003cscript type\u003d\"text/javascript\" async src\u003d\"https://mathjax.codeforces.org/MathJax.js?config\u003dTeX-AMS_HTML-full\"\u003e\u003c/script\u003e","sections":[{"title":"","value":{"format":"HTML","content":"\u003cp\u003eYou have a given picture with size $$$w \\times h$$$. Determine if the given picture has a single \"\u003cspan class\u003d\"tex-font-style-tt\"\u003e+\u003c/span\u003e\" shape or not. A \"\u003cspan class\u003d\"tex-font-style-tt\"\u003e+\u003c/span\u003e\" shape is described below:\u003c/p\u003e\u003cul\u003e \u003cli\u003e A \"\u003cspan class\u003d\"tex-font-style-tt\"\u003e+\u003c/span\u003e\" shape has one center nonempty cell. \u003c/li\u003e\u003cli\u003e There should be some (at least one) consecutive non-empty cells in each direction (left, right, up, down) from the center. In other words, there should be a ray in each direction. \u003c/li\u003e\u003cli\u003e All other cells are empty. \u003c/li\u003e\u003c/ul\u003e\u003cp\u003eFind out if the given picture has single \"\u003cspan class\u003d\"tex-font-style-tt\"\u003e+\u003c/span\u003e\" shape.\u003c/p\u003e"}},{"title":"Input","value":{"format":"HTML","content":"\u003cp\u003eThe first line contains two integers $$$h$$$ and $$$w$$$ ($$$1 \\le h$$$, $$$w \\le 500$$$)\u0026nbsp;— the height and width of the picture.\u003c/p\u003e\u003cp\u003eThe $$$i$$$-th of the next $$$h$$$ lines contains string $$$s_{i}$$$ of length $$$w$$$ consisting \"\u003cspan class\u003d\"tex-font-style-tt\"\u003e.\u003c/span\u003e\" and \"\u003cspan class\u003d\"tex-font-style-tt\"\u003e*\u003c/span\u003e\" where \"\u003cspan class\u003d\"tex-font-style-tt\"\u003e.\u003c/span\u003e\" denotes the empty space and \"\u003cspan class\u003d\"tex-font-style-tt\"\u003e*\u003c/span\u003e\" denotes the non-empty space.\u003c/p\u003e"}},{"title":"Output","value":{"format":"HTML","content":"\u003cp\u003eIf the given picture satisfies all conditions, print \"\u003cspan class\u003d\"tex-font-style-tt\"\u003eYES\u003c/span\u003e\". Otherwise, print \"\u003cspan class\u003d\"tex-font-style-tt\"\u003eNO\u003c/span\u003e\".\u003c/p\u003e\u003cp\u003eYou can output each letter in any case (upper or lower).\u003c/p\u003e"}},{"title":"Examples","value":{"format":"HTML","content":"\u003ctable class\u003d\u0027vjudge_sample\u0027\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\u003e5 6\n......\n..*...\n.****.\n..*...\n..*...\n\u003c/pre\u003e\u003c/td\u003e\n \u003ctd\u003e\u003cpre\u003eYES\n\u003c/pre\u003e\u003c/td\u003e\n \u003c/tr\u003e\n\u003c/tbody\u003e\n\u003c/table\u003e\n"}},{"title":"","value":{"format":"HTML","content":"\u003ctable class\u003d\u0027vjudge_sample\u0027\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\u003e3 5\n..*..\n****.\n.*...\n\u003c/pre\u003e\u003c/td\u003e\n \u003ctd\u003e\u003cpre\u003eNO\n\u003c/pre\u003e\u003c/td\u003e\n \u003c/tr\u003e\n\u003c/tbody\u003e\n\u003c/table\u003e\n"}},{"title":"","value":{"format":"HTML","content":"\u003ctable class\u003d\u0027vjudge_sample\u0027\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\u003e7 7\n.......\n...*...\n..****.\n...*...\n...*...\n.......\n.*.....\n\u003c/pre\u003e\u003c/td\u003e\n \u003ctd\u003e\u003cpre\u003eNO\n\u003c/pre\u003e\u003c/td\u003e\n \u003c/tr\u003e\n\u003c/tbody\u003e\n\u003c/table\u003e\n"}},{"title":"","value":{"format":"HTML","content":"\u003ctable class\u003d\u0027vjudge_sample\u0027\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\u003e5 6\n..**..\n..**..\n******\n..**..\n..**..\n\u003c/pre\u003e\u003c/td\u003e\n \u003ctd\u003e\u003cpre\u003eNO\n\u003c/pre\u003e\u003c/td\u003e\n \u003c/tr\u003e\n\u003c/tbody\u003e\n\u003c/table\u003e\n"}},{"title":"","value":{"format":"HTML","content":"\u003ctable class\u003d\u0027vjudge_sample\u0027\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\u003e3 7\n.*...*.\n***.***\n.*...*.\n\u003c/pre\u003e\u003c/td\u003e\n \u003ctd\u003e\u003cpre\u003eNO\n\u003c/pre\u003e\u003c/td\u003e\n \u003c/tr\u003e\n\u003c/tbody\u003e\n\u003c/table\u003e\n"}},{"title":"","value":{"format":"HTML","content":"\u003ctable class\u003d\u0027vjudge_sample\u0027\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\u003e5 10\n..........\n..*.......\n.*.******.\n..*.......\n..........\n\u003c/pre\u003e\u003c/td\u003e\n \u003ctd\u003e\u003cpre\u003eNO\n\u003c/pre\u003e\u003c/td\u003e\n \u003c/tr\u003e\n\u003c/tbody\u003e\n\u003c/table\u003e\n"}},{"title":"Note","value":{"format":"HTML","content":"\u003cp\u003eIn the first example, the given picture contains one \"\u003cspan class\u003d\"tex-font-style-tt\"\u003e+\u003c/span\u003e\".\u003c/p\u003e\u003cp\u003eIn the second example, two vertical branches are located in a different column.\u003c/p\u003e\u003cp\u003eIn the third example, there is a dot outside of the shape.\u003c/p\u003e\u003cp\u003eIn the fourth example, the width of the two vertical branches is $$$2$$$.\u003c/p\u003e\u003cp\u003eIn the fifth example, there are two shapes.\u003c/p\u003e\u003cp\u003eIn the sixth example, there is an empty space inside of the shape.\u003c/p\u003e"}}]}