2025-08-15 09:22:34 +0000 UTC

Reformat Phone Number
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Code

class Solution:
    def reformatNumber(self, number: str) -> str:
        digits = []
        for char in number:
            if char == " " or char == "-":
                continue
            digits.append(char)
        res = []
        digits.reverse()
        while len(digits) > 4:
            res.append("".join((digits.pop(), digits.pop(), digits.pop())))
        length = len(digits)
        if length == 4:
            res.append("".join((digits.pop(), digits.pop())))
            res.append("".join((digits.pop(), digits.pop())))
        elif length == 3:
            res.append("".join((digits.pop(), digits.pop(), digits.pop())))
        elif length == 2:
            res.append("".join((digits.pop(), digits.pop())))
        return "-".join(res)