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
while True:
try:
str = list(input())
res = ""
pos = 0
for s in str:
if str.count(s) == 1 and pos == 0:
res = s
pos = 1 # 只打印第一个，类推打印第多少个都可以
print(res)
if pos == 0:
print(-1)
except:
break
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