{"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\"\u003eztr loves lucky numbers. Everybody knows that positive integers are lucky if their decimal representation doesn\u0027t contain digits other than 4 and 7. For example, numbers 47, 744, 4 are lucky and 5, 17, 467 are not.\u003cbr\u003e\u003cbr\u003eLucky number is super lucky if it\u0027s decimal representation contains equal amount of digits 4 and 7. For example, numbers 47, 7744, 474477 are super lucky and 4, 744, 467 are not.\u003cbr\u003e\u003cbr\u003eOne day ztr came across a positive integer n. Help him to find the least super lucky number which is not less than n.\u003cbr\u003e\u003c/div\u003e"}},{"title":"Input","value":{"format":"HTML","content":"There are T$(1\\leq\\;n\\leq\\;10^{5})$ cases\u003cbr\u003e\u003cbr\u003eFor each cases:\u003cbr\u003e\u003cbr\u003eThe only line contains a positive integer $n(1\\leq\\;n\\leq\\;10^{18})$. This number doesn\u0027t have leading zeroes.\u003cbr\u003e"}},{"title":"Output","value":{"format":"HTML","content":"For each cases\u003cbr\u003eOutput 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\u003e2\r\n4500\r\n47\u003c/pre\u003e\u003c/td\u003e\n \u003ctd\u003e\u003cpre\u003e4747\r\n47\u003c/pre\u003e\u003c/td\u003e\n \u003c/tr\u003e\n\u003c/tbody\u003e\n\u003c/table\u003e\n"}}]}