How to Write a Message

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One day, you decided to write a message to your girl friend consisting of N uppercase English letters. Your girlfriend's alphabet is limited to only two letters: 'A' and 'B'. She recognizes only the words that are of length M containing letters from her alphabet. There are some words that your girlfriend hates. You are given two strings X and Y, which represent some two words she recognizes. Yo

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solution.cppC++17

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