{"trustable":false,"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\"\u003e\n 给定两个长度一致且仅包含小写字母的字符串 $A$ 和 $B$ 。你有一把魔法刷子,刷一次,就能够把字符串 $A$ 当中的一个区间内的所有字母替换为相同的任意一种字母。问你至少需要刷几次,才能使字符串 $A$ 变得和字符串 $B$ 完全一致?\n\u003c/div\u003e"}},{"title":"Input","value":{"format":"HTML","content":"多测。读入到EOF结束。\n\u003cbr\u003e\n每组测试数据第一行读入串 $A$ ,第二行读入串 $B$ 。\n\u003cbr\u003e\n保证所有串长不超过 100 。\n\u003cbr\u003e"}},{"title":"Output","value":{"format":"HTML","content":"A single line contains one integer representing the 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\u003ezzzzzfzzzzz\nabcdefedcba\nabababababab\ncdcdcdcdcdcd\n\u003c/pre\u003e\u003c/td\u003e\n \u003ctd\u003e\u003cpre\u003e6\n7\n\u003c/pre\u003e\u003c/td\u003e\n \u003c/tr\u003e\n\u003c/tbody\u003e\n\u003c/table\u003e\n"}}]}