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# Runtime: 78 ms (Top 10.28%) | Memory: 14 MB (Top 20.56%)
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class Solution:
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    def getLucky(self, s: str, k: int) -> int:
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        nums = [str(ord(c) - ord("a") + 1) for c in s]
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        for _ in range(k):
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            nums = str(sum(int(digit) for num in nums for digit in num))
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        return nums