{"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\u003ePikachu had an array with him. He wrote down all the non-empty subsequences of the array on paper. Note that an array of size \u003cspan class\u003d\"tex-span\"\u003e\u003ci\u003en\u003c/i\u003e\u003c/span\u003e has \u003cspan class\u003d\"tex-span\"\u003e2\u003csup class\u003d\"upper-index\"\u003e\u003ci\u003en\u003c/i\u003e\u003c/sup\u003e - 1\u003c/span\u003e non-empty subsequences in it. \u003c/p\u003e\u003cp\u003ePikachu being mischievous as he always is, removed all the subsequences in which \u003cspan class\u003d\"tex-font-style-tt\"\u003eMaximum_element_of_the_subsequence\u003c/span\u003e \u003cspan class\u003d\"tex-span\"\u003e - \u003c/span\u003e \u003cspan class\u003d\"tex-font-style-tt\"\u003eMinimum_element_of_subsequence\u003c/span\u003e \u003cspan class\u003d\"tex-span\"\u003e ≥ \u003ci\u003ed\u003c/i\u003e\u003c/span\u003e\u003c/p\u003e\u003cp\u003ePikachu was finally left with \u003cspan class\u003d\"tex-span\"\u003e\u003ci\u003eX\u003c/i\u003e\u003c/span\u003e subsequences. \u003c/p\u003e\u003cp\u003eHowever, he lost the initial array he had, and now is in serious trouble. He still remembers the numbers \u003cspan class\u003d\"tex-span\"\u003e\u003ci\u003eX\u003c/i\u003e\u003c/span\u003e and \u003cspan class\u003d\"tex-span\"\u003e\u003ci\u003ed\u003c/i\u003e\u003c/span\u003e. He now wants you to construct any such array which will satisfy the above conditions. All the numbers in the final array should be positive integers less than \u003cspan class\u003d\"tex-span\"\u003e10\u003csup class\u003d\"upper-index\"\u003e18\u003c/sup\u003e\u003c/span\u003e. \u003c/p\u003e\u003cp\u003eNote the number of elements in the output array should not be more than \u003cspan class\u003d\"tex-span\"\u003e10\u003csup class\u003d\"upper-index\"\u003e4\u003c/sup\u003e\u003c/span\u003e. If no answer is possible, print \u003cspan class\u003d\"tex-span\"\u003e - 1\u003c/span\u003e.\u003c/p\u003e"}},{"title":"Input","value":{"format":"HTML","content":"\u003cp\u003eThe only line of input consists of two space separated integers \u003cspan class\u003d\"tex-span\"\u003e\u003ci\u003eX\u003c/i\u003e\u003c/span\u003e and \u003cspan class\u003d\"tex-span\"\u003e\u003ci\u003ed\u003c/i\u003e\u003c/span\u003e (\u003cspan class\u003d\"tex-span\"\u003e1 ≤ \u003ci\u003eX\u003c/i\u003e, \u003ci\u003ed\u003c/i\u003e ≤ 10\u003csup class\u003d\"upper-index\"\u003e9\u003c/sup\u003e\u003c/span\u003e).\u003c/p\u003e"}},{"title":"Output","value":{"format":"HTML","content":"\u003cp\u003eOutput should consist of two lines.\u003c/p\u003e\u003cp\u003eFirst line should contain a single integer \u003cspan class\u003d\"tex-span\"\u003e\u003ci\u003en\u003c/i\u003e\u003c/span\u003e (\u003cspan class\u003d\"tex-span\"\u003e1 ≤ \u003ci\u003en\u003c/i\u003e ≤ 10 000\u003c/span\u003e)— the number of integers in the final array.\u003c/p\u003e\u003cp\u003eSecond line should consist of \u003cspan class\u003d\"tex-span\"\u003e\u003ci\u003en\u003c/i\u003e\u003c/span\u003e space separated integers — \u003cspan class\u003d\"tex-span\"\u003e\u003ci\u003ea\u003c/i\u003e\u003csub class\u003d\"lower-index\"\u003e1\u003c/sub\u003e, \u003ci\u003ea\u003c/i\u003e\u003csub class\u003d\"lower-index\"\u003e2\u003c/sub\u003e, ... , \u003ci\u003ea\u003c/i\u003e\u003csub class\u003d\"lower-index\"\u003e\u003ci\u003en\u003c/i\u003e\u003c/sub\u003e\u003c/span\u003e (\u003cspan class\u003d\"tex-span\"\u003e1 ≤ \u003ci\u003ea\u003c/i\u003e\u003csub class\u003d\"lower-index\"\u003e\u003ci\u003ei\u003c/i\u003e\u003c/sub\u003e \u0026lt; 10\u003csup class\u003d\"upper-index\"\u003e18\u003c/sup\u003e\u003c/span\u003e).\u003c/p\u003e\u003cp\u003eIf there is no answer, print a single integer \u003cspan class\u003d\"tex-font-style-tt\"\u003e-1\u003c/span\u003e. If there are multiple answers, print any of them.\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\u003e10 5\n\u003c/pre\u003e\u003c/td\u003e\n \u003ctd\u003e\u003cpre\u003e6\n5 50 7 15 6 100\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\u003e4 2\n\u003c/pre\u003e\u003c/td\u003e\n \u003ctd\u003e\u003cpre\u003e4\n10 100 1000 10000\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 output of the first example case, the remaining subsequences after removing those with \u003cspan class\u003d\"tex-font-style-tt\"\u003eMaximum_element_of_the_subsequence\u003c/span\u003e \u003cspan class\u003d\"tex-span\"\u003e - \u003c/span\u003e \u003cspan class\u003d\"tex-font-style-tt\"\u003eMinimum_element_of_subsequence\u003c/span\u003e \u003cspan class\u003d\"tex-span\"\u003e ≥ 5\u003c/span\u003e are \u003cspan class\u003d\"tex-span\"\u003e[5], [5, 7], [5, 6], [5, 7, 6], [50], [7], [7, 6], [15], [6], [100]\u003c/span\u003e. There are \u003cspan class\u003d\"tex-span\"\u003e10\u003c/span\u003e of them. Hence, the array \u003cspan class\u003d\"tex-span\"\u003e[5, 50, 7, 15, 6, 100]\u003c/span\u003e is valid.\u003c/p\u003e\u003cp\u003eSimilarly, in the output of the second example case, the remaining sub-sequences after removing those with \u003cspan class\u003d\"tex-font-style-tt\"\u003eMaximum_element_of_the_subsequence\u003c/span\u003e \u003cspan class\u003d\"tex-span\"\u003e - \u003c/span\u003e \u003cspan class\u003d\"tex-font-style-tt\"\u003eMinimum_element_of_subsequence\u003c/span\u003e \u003cspan class\u003d\"tex-span\"\u003e ≥ 2\u003c/span\u003e are \u003cspan class\u003d\"tex-span\"\u003e[10], [100], [1000], [10000]\u003c/span\u003e. There are \u003cspan class\u003d\"tex-span\"\u003e4\u003c/span\u003e of them. Hence, the array \u003cspan class\u003d\"tex-span\"\u003e[10, 100, 1000, 10000]\u003c/span\u003e is valid.\u003c/p\u003e"}}]}