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()
dic = {}
for i in s:
if i not in dic:
dic[i] = 1
else:
dic[i] += 1
value = []
for k, v in dic.items():
value.append(v)
for k, v in dic.items():
if v == 1:
print(k)
break
if 1 not in value:
print('-1')
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