{"trustable":true,"prependHtml":"\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 async src\u003d\"https://mathjax.codeforces.org/MathJax.js?config\u003dTeX-AMS-MML_HTMLorMML\" type\u003d\"text/javascript\"\u003e\u003c/script\u003e","sections":[{"title":"","value":{"format":"HTML","content":"\u003cdiv class\u003d\"panel_content\"\u003eVictor loves to play with string. He thinks a string is charming as the string is a palindromic string.\u003cbr\u003e\u003cbr\u003eVictor wants to play $n$ times. Each time he will do one of following four operations.\u003cbr\u003e\u003cbr\u003eOperation 1 : add a char $c$ to the beginning of the string.\u003cbr\u003e\u003cbr\u003eOperation 2 : add a char $c$ to the end of the string.\u003cbr\u003e\u003cbr\u003eOperation 3 : ask the number of different charming substrings.\u003cbr\u003e\u003cbr\u003eOperation 4 : ask the number of charming substrings, the same substrings which starts in different location has to be counted.\u003cbr\u003e\u003cbr\u003eAt the beginning, Victor has an empty string.\u003c/div\u003e"}},{"title":"Input","value":{"format":"HTML","content":"The input contains several test cases, at most $5$ cases.\u003cbr\u003e\u003cbr\u003eIn each case, the first line has one integer $n$ means the number of operations.\u003cbr\u003e\u003cbr\u003eThe first number of next $n$ line is the integer $op$, meaning the type of operation. If $op$\u003d$1$ or $2$, there will be a lowercase English letters followed.\u003cbr\u003e\u003cbr\u003e$1\\leq n \\leq 100000$."}},{"title":"Output","value":{"format":"HTML","content":"For each query operation(operation 3 or 4), print the correct answer."}},{"title":"Sample","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\u003e6\r\n1 a\r\n1 b\r\n2 a\r\n2 c\r\n3\r\n4\r\n8\r\n1 a\r\n2 a\r\n2 a\r\n1 a\r\n3\r\n1 b\r\n3\r\n4\u003c/pre\u003e\u003c/td\u003e\n \u003ctd\u003e\u003cpre\u003e4\r\n5\r\n4\r\n5\r\n11\u003c/pre\u003e\u003c/td\u003e\n \u003c/tr\u003e\n\u003c/tbody\u003e\n\u003c/table\u003e\n"}}]}