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class Solution:
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    def reformatNumber(self, number: str) -> str:
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        s = number.replace(" ", "").replace("-", "")
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        pieces = list()
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        while s:
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            if len(s) == 2:
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                pieces.append(s)
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                break
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            elif len(s) == 4:
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                pieces.append(s[:2])
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                pieces.append(s[2:])
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                break
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            else:
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                pieces.append(s[:3])
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                s = s[3:]
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        return "-".join(pieces)