{"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":"MD","content":"中秋節,月光皎潔,深愛漢語文化的參踢決定要來吟詩作對。\n\n他的好友滴欸寫了一首詩句,然而參踢真是聰明過分,總覺得滴欸的詩句不太漂亮,非自己修改不可。參踢認為好的詩句應該要符合「回文」的條件。\n\n給你一個字串,請問參踢有沒有辦法在修改恰一個字元後使該字串變為回文?\n\n一個字串為回文若其從前往後讀與從後往前讀的每個字元皆相同。"}},{"title":"Input","value":{"format":"MD","content":"輸入僅一行,包含一由小寫字母組成的字串 ***S*** (1 ≤ | ***S*** | ≤ 15)。"}},{"title":"Output","value":{"format":"MD","content":"若參踢能在修改恰一個字元後使該字串變為回文,請輸出```\"YES\"```(不含引號);否則,輸出```\"NO\"```(不含引號)。"}},{"title":"Sample Input 1","value":{"format":"MD","content":"```\nabccaa\n```"}},{"title":"Sample Output 1","value":{"format":"MD","content":"```\nYES\n```"}},{"title":"Sample Input 2","value":{"format":"MD","content":"```\ntysssjs\n```\n"}},{"title":"Sample Output 2","value":{"format":"MD","content":"```\nNO\n```\n"}}]}