题解 | #字符个数统计#
字符个数统计
https://www.nowcoder.com/practice/eb94f6a5b2ba49c6ac72d40b5ce95f50
a=input()
b=''
for i in a:
if i not in b:
b+=i
print(len(b))
字符个数统计
https://www.nowcoder.com/practice/eb94f6a5b2ba49c6ac72d40b5ce95f50
a=input()
b=''
for i in a:
if i not in b:
b+=i
print(len(b))
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