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
astr = input()
found = False
for cha in astr:
if astr.count(cha) == 1:
print(cha)
found = True
break
if not found:
print(-1)
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