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()
d = {}
for i in s:
if i not in d:
d[i] = s.count(i)
ls = []
for k,v in d.items():
if v == 1:
ls.append(k)
if len(ls) != 0:
print(ls[0])
else:
print(-1)
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