String Permutation

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Given a string, your task is to generate all different strings that can be created using its characters. ###Input: - The only input line has a string of length $n$. Each character is between a–z. ###Output: - First print an integer $k$: the number of strings. Then print $k$ lines: the strings in alphabetical order. ###Constraints - $1 \leq n \leq 8$ ###Sample Input: abc ##

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solution.cppC++17

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