Lucky Number
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In some Asian countries, 8 and 6 are considered lucky digits. Any number containing only 8s and 6s is considered lucky number, e.g. 6, 8, 66, 668, 88, 886 .... Nguyen is a student who likes mathematics very much. Nguyen likes lucky numbers but only of the form S = 8...86...6 where S has at least one digit and the number of 8s or 6s can be zero. Examples of S are 8, 88, 6, 66, 86, 886, 8866 ...
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solution.cppC++17
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