Minimum Consecutive Cards to Pick Up LeetCode solution in Python

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class Solution:
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    def minimumCardPickup(self, cards: List[int]) -> int:
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        d = {}
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        x = []
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        for i in range(len(cards)):
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            if cards[i] not in d:
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                d[cards[i]] = i
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            else:
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                x.append(i - d[cards[i]])
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                d[cards[i]] = i
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        if len(x) <= 0:
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            return -1
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        return min(x) + 1