Count the Number of Consistent Strings LeetCode solution in Python

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# Runtime: 236 ms (Top 95.16%) | Memory: 16 MB (Top 85.69%)
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class Solution:
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    def countConsistentStrings(self, allowed: str, words: List[str]) -> int:
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        allowed = set(allowed)
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        count = 0
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        for word in words:
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            for letter in word:
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                if letter not in allowed:
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                    count += 1
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                    break
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        return len(words) - count