题解 | 字符个数统计
import sys
s = set(input())
count_s = 0
for i in s:
if 0<= ord(i) <=127:
count_s += 1
print(count_s)
import sys
s = set(input())
count_s = 0
for i in s:
if 0<= ord(i) <=127:
count_s += 1
print(count_s)
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