题解 | #找出字符串中第一个只出现一次的字符#

s = input()
result = 0
a = [i for i in s]
b = []
for i in s:
    if i not in b:
        b.append(i)

for i in b:
    if a.count(i) == 1:
        result = i
        break
    else:
        continue

if result:
    print(result)
else:
    print(-1)
😄