Special String

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Mani has a string S and an integer d in hand. He has to deal with special strings now :( . A string is a special string if the length of its Longest Palindromic Substring is less than d. He needs to find the lexicographically smallest special string X among all special strings which are lexicographically larger than S If there is no possible value of X, print "Impossible"(without quotes) Input

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solution.cppC++17

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