{"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\n\u003cscript\u003e\n window.katexOptions \u003d {\n delimiters: [\n {left: \u0027$$$$$$\u0027, right: \u0027$$$$$$\u0027, display: true},\n {left: \u0027$$$\u0027, right: \u0027$$$\u0027, display: false},\n {left: \u0027$$\u0027, right: \u0027$$\u0027, display: true},\n {left: \u0027$\u0027, right: \u0027$\u0027, display: false}\n ]\n };\n\u003c/script\u003e\n","sections":[{"title":"","value":{"format":"HTML","content":"\u003cp\u003ePolycarp loves lowercase letters and dislikes uppercase ones. Once he got a string \u003cspan class\u003d\"tex-span\"\u003e\u003ci\u003es\u003c/i\u003e\u003c/span\u003e consisting only of lowercase and uppercase Latin letters.\u003c/p\u003e\u003cp\u003eLet \u003cspan class\u003d\"tex-span\"\u003e\u003ci\u003eA\u003c/i\u003e\u003c/span\u003e be a set of positions in the string. Let\u0027s call it \u003cspan class\u003d\"tex-font-style-it\"\u003epretty\u003c/span\u003e if following conditions are met:\u003c/p\u003e\u003cul\u003e \u003cli\u003e letters on positions from \u003cspan class\u003d\"tex-span\"\u003e\u003ci\u003eA\u003c/i\u003e\u003c/span\u003e in the string are all distinct and lowercase; \u003c/li\u003e\u003cli\u003e there are no uppercase letters in the string which are situated between positions from \u003cspan class\u003d\"tex-span\"\u003e\u003ci\u003eA\u003c/i\u003e\u003c/span\u003e (i.e. there is no such \u003cspan class\u003d\"tex-span\"\u003e\u003ci\u003ej\u003c/i\u003e\u003c/span\u003e that \u003cspan class\u003d\"tex-span\"\u003e\u003ci\u003es\u003c/i\u003e[\u003ci\u003ej\u003c/i\u003e]\u003c/span\u003e is an uppercase letter, and \u003cspan class\u003d\"tex-span\"\u003e\u003ci\u003ea\u003c/i\u003e\u003csub class\u003d\"lower-index\"\u003e1\u003c/sub\u003e \u0026lt; \u003ci\u003ej\u003c/i\u003e \u0026lt; \u003ci\u003ea\u003c/i\u003e\u003csub class\u003d\"lower-index\"\u003e2\u003c/sub\u003e\u003c/span\u003e for some \u003cspan class\u003d\"tex-span\"\u003e\u003ci\u003ea\u003c/i\u003e\u003csub class\u003d\"lower-index\"\u003e1\u003c/sub\u003e\u003c/span\u003e and \u003cspan class\u003d\"tex-span\"\u003e\u003ci\u003ea\u003c/i\u003e\u003csub class\u003d\"lower-index\"\u003e2\u003c/sub\u003e\u003c/span\u003e from \u003cspan class\u003d\"tex-span\"\u003e\u003ci\u003eA\u003c/i\u003e\u003c/span\u003e). \u003c/li\u003e\u003c/ul\u003e\u003cp\u003eWrite a program that will determine the maximum number of elements in a \u003cspan class\u003d\"tex-font-style-it\"\u003epretty\u003c/span\u003e set of positions.\u003c/p\u003e"}},{"title":"Input","value":{"format":"HTML","content":"\u003cp\u003eThe first line contains 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 ≤ 200\u003c/span\u003e) — length of string \u003cspan class\u003d\"tex-span\"\u003e\u003ci\u003es\u003c/i\u003e\u003c/span\u003e.\u003c/p\u003e\u003cp\u003eThe second line contains a string \u003cspan class\u003d\"tex-span\"\u003e\u003ci\u003es\u003c/i\u003e\u003c/span\u003e consisting of lowercase and uppercase Latin letters.\u003c/p\u003e"}},{"title":"Output","value":{"format":"HTML","content":"\u003cp\u003ePrint maximum number of elements in \u003cspan class\u003d\"tex-font-style-it\"\u003epretty\u003c/span\u003e set of positions for string \u003cspan class\u003d\"tex-span\"\u003e\u003ci\u003es\u003c/i\u003e\u003c/span\u003e.\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\u003e11\naaaaBaabAbA\n\u003c/pre\u003e\u003c/td\u003e\n \u003ctd\u003e\u003cpre\u003e2\n\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\u003e12\nzACaAbbaazzC\n\u003c/pre\u003e\u003c/td\u003e\n \u003ctd\u003e\u003cpre\u003e3\n\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\u003e3\nABC\n\u003c/pre\u003e\u003c/td\u003e\n \u003ctd\u003e\u003cpre\u003e0\n\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 first example the desired positions might be \u003cspan class\u003d\"tex-span\"\u003e6\u003c/span\u003e and \u003cspan class\u003d\"tex-span\"\u003e8\u003c/span\u003e or \u003cspan class\u003d\"tex-span\"\u003e7\u003c/span\u003e and \u003cspan class\u003d\"tex-span\"\u003e8\u003c/span\u003e. Positions \u003cspan class\u003d\"tex-span\"\u003e6\u003c/span\u003e and \u003cspan class\u003d\"tex-span\"\u003e7\u003c/span\u003e contain letters \u0027\u003cspan class\u003d\"tex-font-style-tt\"\u003ea\u003c/span\u003e\u0027, position \u003cspan class\u003d\"tex-span\"\u003e8\u003c/span\u003e contains letter \u0027\u003cspan class\u003d\"tex-font-style-tt\"\u003eb\u003c/span\u003e\u0027. The pair of positions \u003cspan class\u003d\"tex-span\"\u003e1\u003c/span\u003e and \u003cspan class\u003d\"tex-span\"\u003e8\u003c/span\u003e is not suitable because there is an uppercase letter \u0027\u003cspan class\u003d\"tex-font-style-tt\"\u003eB\u003c/span\u003e\u0027 between these position.\u003c/p\u003e\u003cp\u003eIn the second example desired positions can be \u003cspan class\u003d\"tex-span\"\u003e7\u003c/span\u003e, \u003cspan class\u003d\"tex-span\"\u003e8\u003c/span\u003e and \u003cspan class\u003d\"tex-span\"\u003e11\u003c/span\u003e. There are other ways to choose \u003cspan class\u003d\"tex-font-style-it\"\u003epretty\u003c/span\u003e set consisting of three elements.\u003c/p\u003e\u003cp\u003eIn the third example the given string \u003cspan class\u003d\"tex-span\"\u003e\u003ci\u003es\u003c/i\u003e\u003c/span\u003e does not contain any lowercase letters, so the answer is \u003cspan class\u003d\"tex-span\"\u003e0\u003c/span\u003e.\u003c/p\u003e"}}]}