Longest Uncommon Subsequence I LeetCode solution in Python

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# Runtime: 47 ms (Top 54.94%) | Memory: 13.9 MB (Top 58.35%)
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class Solution:
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    def findLUSlength(self, a: str, b: str) -> int:
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        if a == b:
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            return -1
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        else:
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            return max(len(a), len(b))