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
x= 1
word = list(input().rstrip())
str1 = ""
for i in word:
list_already_used = []
if word.count(i)==1 and i not in list_already_used:
print(i)
str1 += i
break
# list_already_used.append(i)
if len(str1)==0:
print(-1)
#else:
# print(str1)
