{"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\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$$\u0027]]\n }\n });\n\u003c/script\u003e\n\u003cscript type\u003d\"text/javascript\" async src\u003d\"https://mathjax.codeforces.org/MathJax.js?config\u003dTeX-AMS_HTML-full\"\u003e\u003c/script\u003e","sections":[{"title":"","value":{"format":"HTML","content":"\u003cp\u003e\u003cspan class\u003d\"tex-font-style-it\"\u003eAs their story unravels, a timeless tale is told once again...\u003c/span\u003e\u003c/p\u003e\u003cp\u003e\u003cspan class\u003d\"tex-font-style-it\"\u003eShirahime, a friend of Mocha\u0027s, is keen on playing the music game Arcaea and sharing Mocha interesting puzzles to solve. This day, Shirahime comes up with a new simple puzzle and wants Mocha to solve them. However, these puzzles are too easy for Mocha to solve, so she wants you to solve them and tell her the answers. The puzzles are described as follow.\u003c/span\u003e\u003c/p\u003e\u003cp\u003eThere are $$$n$$$ squares arranged in a row, and each of them can be painted either red or blue.\u003c/p\u003e\u003cp\u003eAmong these squares, some of them have been painted already, and the others are blank. You can decide which color to paint on each blank square.\u003c/p\u003e\u003cp\u003eSome pairs of adjacent squares may have the same color, which is imperfect. We define the \u003cspan class\u003d\"tex-font-style-it\"\u003eimperfectness\u003c/span\u003e as the number of pairs of adjacent squares that share the same color.\u003c/p\u003e\u003cp\u003eFor example, the imperfectness of \"\u003cspan class\u003d\"tex-font-style-tt\"\u003eBRRRBBR\u003c/span\u003e\" is $$$3$$$, with \"\u003cspan class\u003d\"tex-font-style-tt\"\u003eBB\u003c/span\u003e\" occurred once and \"\u003cspan class\u003d\"tex-font-style-tt\"\u003eRR\u003c/span\u003e\" occurred twice.\u003c/p\u003e\u003cp\u003eYour goal is to minimize the imperfectness and print out the colors of the squares after painting. \u003c/p\u003e"}},{"title":"Input","value":{"format":"HTML","content":"\u003cp\u003eEach test contains multiple test cases. \u003c/p\u003e\u003cp\u003eThe first line contains a single integer $$$t$$$ ($$$1 \\le t \\le 100$$$) — the number of test cases. Each test case consists of two lines.\u003c/p\u003e\u003cp\u003eThe first line of each test case contains an integer $$$n$$$ ($$$1\\leq n\\leq 100$$$) — the length of the squares row.\u003c/p\u003e\u003cp\u003eThe second line of each test case contains a string $$$s$$$ with length $$$n$$$, containing characters \u0027\u003cspan class\u003d\"tex-font-style-tt\"\u003eB\u003c/span\u003e\u0027, \u0027\u003cspan class\u003d\"tex-font-style-tt\"\u003eR\u003c/span\u003e\u0027 and \u0027\u003cspan class\u003d\"tex-font-style-tt\"\u003e?\u003c/span\u003e\u0027. Here \u0027\u003cspan class\u003d\"tex-font-style-tt\"\u003eB\u003c/span\u003e\u0027 stands for a blue square, \u0027\u003cspan class\u003d\"tex-font-style-tt\"\u003eR\u003c/span\u003e\u0027 for a red square, and \u0027\u003cspan class\u003d\"tex-font-style-tt\"\u003e?\u003c/span\u003e\u0027 for a blank square.\u003c/p\u003e"}},{"title":"Output","value":{"format":"HTML","content":"\u003cp\u003eFor each test case, print a line with a string only containing \u0027\u003cspan class\u003d\"tex-font-style-tt\"\u003eB\u003c/span\u003e\u0027 and \u0027\u003cspan class\u003d\"tex-font-style-tt\"\u003eR\u003c/span\u003e\u0027, the colors of the squares after painting, which imperfectness is minimized. If there are multiple solutions, print any of them.\u003c/p\u003e"}},{"title":"Examples","value":{"format":"HTML","content":"\u003ctable class\u003d\u0027vjudge_sample\u0027\u003e\n\u003cthead\u003e\n \u003ctr\u003e\n \u003cth\u003eInput\u003c/th\u003e\n \u003cth\u003eOutput\u003c/th\u003e\n \u003c/tr\u003e\n\u003c/thead\u003e\n\u003ctbody\u003e\n \u003ctr\u003e\n \u003ctd\u003e\u003cpre\u003e5\n7\n?R???BR\n7\n???R???\n1\n?\n1\nB\n10\n?R??RB??B?\n\u003c/pre\u003e\u003c/td\u003e\n \u003ctd\u003e\u003cpre\u003eBRRBRBR\nBRBRBRB\nB\nB\nBRRBRBBRBR\u003c/pre\u003e\u003c/td\u003e\n \u003c/tr\u003e\n\u003c/tbody\u003e\n\u003c/table\u003e\n"}},{"title":"Note","value":{"format":"HTML","content":"\u003cp\u003eIn the first test case, if the squares are painted \"\u003cspan class\u003d\"tex-font-style-tt\"\u003eBRRBRBR\u003c/span\u003e\", the imperfectness is $$$1$$$ (since squares $$$2$$$ and $$$3$$$ have the same color), which is the minimum possible imperfectness.\u003c/p\u003e"}}]}