题解 | 字符个数统计
s = input('') L = len(s) List = [] for i in range(L): if s[i] in List: continue else: List.append(s[i]) print(len(List))
s = input('') L = len(s) List = [] for i in range(L): if s[i] in List: continue else: List.append(s[i]) print(len(List))
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