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class Solution:
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    def compress(self, chars: List[str]) -> int:
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        stri = ""
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        stack = [chars.pop(0)]
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        while chars:
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            p = chars.pop(0)
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            if p in stack:
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                stack.append(p)
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            else:
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                stri = stri + stack[-1] + str(len(stack) if len(stack) > 1 else "")
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                stack = [p]
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        o = list(stri + stack[-1] + str(len(stack) if len(stack) > 1 else ""))
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        for i in o:
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            chars.append(i)