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# Runtime: 80 ms (Top 5.3%) | Memory: 16.30 MB (Top 72.1%)
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class Solution:
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    def secondHighest(self, s: str) -> int:
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        nums = []
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        for char in s:
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            if char.isdigit():
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                nums.append(int(char))
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        nums = [num for num in nums if num != max(nums)]
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        if len(nums) >= 1:
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            return max(nums)
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        else:
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            return -1