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 = {}
res = 0
flag = 0
for i in range(len(s)):
if s[i] in dic:
dic[s[i]] += 1
else:
dic[s[i]] = 1
for key,value in dic.items():
if value == 1:
print(key)
flag = 1
break
if flag == 0:
print('-1')
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