题解 | #字符个数统计#
字符个数统计
https://www.nowcoder.com/practice/eb94f6a5b2ba49c6ac72d40b5ce95f50
a = input()
b = []
def countnum(a):
for i in a:
if i in b:
continue
else:
b.append(i)
return len(b)
print(countnum(a))
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