Chef and strings

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Chef is writing some arbitrary strings as he is getting bored. After writing some strings , he thinks that his arrangement of letters is very dirty. Then he is struck by an idea that he can play a game with those arbitrary strings . $NOTE : $ Strings are in form aabbbccdeefffff..... and so on. once the repetition of a letter is over , it can't be repeated again . ( $abbcddddeefff $ $( valid )$ ,

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solution.cppC++17

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