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- n = int(input())
- s = input()
- index = 0
- indexes = {}
- best_result = None
- for index in range(n):
- indexes[s[index]] = index
- if len(indexes) == 4:
- result = max(indexes.values()) - min(indexes.values()) + 1
- if best_result is None or result < best_result:
- best_result = result
- print(best_result or -1)
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