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)