{"trustable":false,"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":"彭神、阿巴和坤坤又想偷溜了,机智的sls为了让他们好好学习,在门上设置锁(就一个字符串),并且告诉他们,密码是其中的一段子串,这样他们三跑不了了吧,哈哈哈哈哈……\u003c/p\u003e\n现在彭神、阿巴和坤坤开始猜锁的密码,但是他们的想法本能地不一样,彭神认为密码是字符串的一个前缀,阿巴认为密码是字符串的一个后缀,坤坤认为密码是字符串中既不是前缀又不是后缀的一段子串。\u003c/p\u003e\n现在请你帮帮他们,在字符串中找到一段子串T,同时满足他们三个人的要求。\u003c/p\u003e\n"}},{"title":"Input","value":{"format":"HTML","content":"现在给你一段字符串S(1 ≤ |S|≤ 1e6),字符串内只含小写字母;"}},{"title":"Output","value":{"format":"HTML","content":"输出最长字符串T,如果答案不存在,则输出” Just a legend”(引号不存在)。"}},{"title":"Examples","value":{"format":"HTML","content":"\u003cdiv class\u003d\"sample-test\"\u003e\n \u003cdiv class\u003d\"input\"\u003e\n \u003cdiv class\u003d\"title\"\u003e\n Input\n \u003c/div\u003e\n \u003cpre\u003efixprefixsuffix\u003cbr\u003e\u003c/pre\u003e\n \u003c/div\u003e\n \u003cdiv class\u003d\"output\"\u003e\n \u003cdiv class\u003d\"title\"\u003e\n Output\n \u003c/div\u003e\n \u003cpre\u003efix\u003c/pre\u003e\n \u003c/div\u003e\n \u003cdiv class\u003d\"input\"\u003e\n \u003cdiv class\u003d\"title\"\u003e\n Input\n \u003c/div\u003e\n \u003cpre\u003eabcdabc\u003cbr\u003e\u003c/pre\u003e\n \u003c/div\u003e\n \u003cdiv class\u003d\"output\"\u003e\n \u003cdiv class\u003d\"title\"\u003e\n Output\n \u003c/div\u003e\n \u003cpre\u003eJust a legend\u003c/pre\u003e\n \u003c/div\u003e\n\u003c/div\u003e"}}]}