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
string = input().strip()
result = '-1'
while True:
if not string:
break
temp = string[0]
if string.count(temp) == 1:
result = temp
break
else:
string = string.replace(temp, '')
print(result)
