题解 | #字符个数统计#笨办法
字符个数统计
https://www.nowcoder.com/practice/eb94f6a5b2ba49c6ac72d40b5ce95f50
import sys
n=input()
n=n.replace('\n','')
sum=0
assert 1<=len(n)<=500
asc=[0]*128
for x in n:
if 0<=ord(x)<=127:
asc[ord(x)]=1
for i in asc:
sum=sum+i
print(sum)
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