Nobita--The poor Mathematician

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Last week, Nobita gifted a new mobile to Shizuka on her birthday. Shizuka was very happy with that lovely gift. This weekend they both were chilling together and she was exploring various features available in her new mobile phone. Suddendly a thought came to her mind while exploring dialpad. A mapping of digit to letters(in dialpad) is shown below: [![download.jpg](https://i.postimg.cc/3NMDYZj0

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solution.cppC++17

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