{"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\u003eThere are two strings \u003cspan class\u003d\"tex-span\"\u003e\u003ci\u003es\u003c/i\u003e\u003c/span\u003e and \u003cspan class\u003d\"tex-span\"\u003e\u003ci\u003et\u003c/i\u003e\u003c/span\u003e, consisting only of letters \u003cspan class\u003d\"tex-font-style-tt\"\u003ea\u003c/span\u003e and \u003cspan class\u003d\"tex-font-style-tt\"\u003eb\u003c/span\u003e. You can make the following operation several times: choose a prefix of \u003cspan class\u003d\"tex-span\"\u003e\u003ci\u003es\u003c/i\u003e\u003c/span\u003e, a prefix of \u003cspan class\u003d\"tex-span\"\u003e\u003ci\u003et\u003c/i\u003e\u003c/span\u003e and swap them. Prefixes \u003cspan class\u003d\"tex-font-style-underline\"\u003ecan be empty\u003c/span\u003e, also a prefix can coincide with a whole string. \u003c/p\u003e\u003cp\u003eYour task is to find a sequence of operations after which one of the strings consists only of \u003cspan class\u003d\"tex-font-style-tt\"\u003ea\u003c/span\u003e letters and the other consists only of \u003cspan class\u003d\"tex-font-style-tt\"\u003eb\u003c/span\u003e letters. The number of operations should be \u003cspan class\u003d\"tex-font-style-underline\"\u003eminimized\u003c/span\u003e.\u003c/p\u003e"}},{"title":"Input","value":{"format":"HTML","content":"\u003cp\u003eThe first line contains a string \u003cspan class\u003d\"tex-span\"\u003e\u003ci\u003es\u003c/i\u003e\u003c/span\u003e (\u003cspan class\u003d\"tex-span\"\u003e1 ≤ |\u003ci\u003es\u003c/i\u003e| ≤ 2·10\u003csup class\u003d\"upper-index\"\u003e5\u003c/sup\u003e\u003c/span\u003e).\u003c/p\u003e\u003cp\u003eThe second line contains a string \u003cspan class\u003d\"tex-span\"\u003e\u003ci\u003et\u003c/i\u003e\u003c/span\u003e (\u003cspan class\u003d\"tex-span\"\u003e1 ≤ |\u003ci\u003et\u003c/i\u003e| ≤ 2·10\u003csup class\u003d\"upper-index\"\u003e5\u003c/sup\u003e\u003c/span\u003e).\u003c/p\u003e\u003cp\u003eHere \u003cspan class\u003d\"tex-span\"\u003e|\u003ci\u003es\u003c/i\u003e|\u003c/span\u003e and \u003cspan class\u003d\"tex-span\"\u003e|\u003ci\u003et\u003c/i\u003e|\u003c/span\u003e denote the lengths of \u003cspan class\u003d\"tex-span\"\u003e\u003ci\u003es\u003c/i\u003e\u003c/span\u003e and \u003cspan class\u003d\"tex-span\"\u003e\u003ci\u003et\u003c/i\u003e\u003c/span\u003e, respectively. It is guaranteed that at least one of the strings contains at least one \u003cspan class\u003d\"tex-font-style-tt\"\u003ea\u003c/span\u003e letter and at least one of the strings contains at least one \u003cspan class\u003d\"tex-font-style-tt\"\u003eb\u003c/span\u003e letter.\u003c/p\u003e"}},{"title":"Output","value":{"format":"HTML","content":"\u003cp\u003eThe first line should contain a single integer \u003cspan class\u003d\"tex-span\"\u003e\u003ci\u003en\u003c/i\u003e\u003c/span\u003e (\u003cspan class\u003d\"tex-span\"\u003e0 ≤ \u003ci\u003en\u003c/i\u003e ≤ 5·10\u003csup class\u003d\"upper-index\"\u003e5\u003c/sup\u003e\u003c/span\u003e)\u0026nbsp;— the number of operations.\u003c/p\u003e\u003cp\u003eEach of the next \u003cspan class\u003d\"tex-span\"\u003e\u003ci\u003en\u003c/i\u003e\u003c/span\u003e lines should contain two space-separated integers \u003cspan class\u003d\"tex-span\"\u003e\u003ci\u003ea\u003c/i\u003e\u003csub class\u003d\"lower-index\"\u003e\u003ci\u003ei\u003c/i\u003e\u003c/sub\u003e\u003c/span\u003e, \u003cspan class\u003d\"tex-span\"\u003e\u003ci\u003eb\u003c/i\u003e\u003csub class\u003d\"lower-index\"\u003e\u003ci\u003ei\u003c/i\u003e\u003c/sub\u003e\u003c/span\u003e\u0026nbsp;— the lengths of prefixes of \u003cspan class\u003d\"tex-span\"\u003e\u003ci\u003es\u003c/i\u003e\u003c/span\u003e and \u003cspan class\u003d\"tex-span\"\u003e\u003ci\u003et\u003c/i\u003e\u003c/span\u003e to swap, respectively.\u003c/p\u003e\u003cp\u003eIf there are multiple possible solutions, you can print any of them. It\u0027s guaranteed that a solution with given constraints exists.\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\u003ebab\nbb\n\u003c/pre\u003e\u003c/td\u003e\n \u003ctd\u003e\u003cpre\u003e2\n1 0\n1 3\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\u003ebbbb\naaa\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, you can solve the problem in two operations:\u003c/p\u003e\u003col\u003e \u003cli\u003e Swap the prefix of the first string with length \u003cspan class\u003d\"tex-span\"\u003e1\u003c/span\u003e and the prefix of the second string with length \u003cspan class\u003d\"tex-span\"\u003e0\u003c/span\u003e. After this swap, you\u0027ll have strings \u003cspan class\u003d\"tex-font-style-tt\"\u003eab\u003c/span\u003e and \u003cspan class\u003d\"tex-font-style-tt\"\u003ebbb\u003c/span\u003e. \u003c/li\u003e\u003cli\u003e Swap the prefix of the first string with length \u003cspan class\u003d\"tex-span\"\u003e1\u003c/span\u003e and the prefix of the second string with length \u003cspan class\u003d\"tex-span\"\u003e3\u003c/span\u003e. After this swap, you\u0027ll have strings \u003cspan class\u003d\"tex-font-style-tt\"\u003ebbbb\u003c/span\u003e and \u003cspan class\u003d\"tex-font-style-tt\"\u003ea\u003c/span\u003e. \u003c/li\u003e\u003c/ol\u003e\u003cp\u003eIn the second example, the strings are already appropriate, so no operations are needed.\u003c/p\u003e"}}]}