题解 | #找出字符串中第一个只出现一次的字符#
找出字符串中第一个只出现一次的字符
https://www.nowcoder.com/practice/e896d0f82f1246a3aa7b232ce38029d4
s = input()
judge = False
for i in s:
if s.count(i) == 1:
print(i)
judge = True
break
if not judge:
print(-1)
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