Differently Lucky Number

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Alice is studying in 5th grade and today her teacher asked her to do the following assignment. Given a number $N$ find out whether it is a differently lucky number or not. A differently lucky number is a number that contains only 3, 5 and 7. For example: 335 is a differently lucky number. 358 is not a differently lucky number.(it contains digit $8$) Help Alice complete her task.

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solution.cppC++17

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