Find the Difference LeetCode solution in Python

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class Solution:
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    def findTheDifference(self, s: str, t: str) -> str:
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        c = 0
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        for cs in s:
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            c ^= ord(cs)  # ord is ASCII value
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        for ct in t:
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            c ^= ord(ct)
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        return chr(c)  # chr = convert ASCII into character