题解 | #字符集合#
字符集合
https://www.nowcoder.com/practice/784efd40ed8e465a84821c8f3970b7b5
while True:
try:
list1=[x for x in input()]
list2=[]
for x in list1:
if x in list2:
continue
else:
list2.append(x)
print(''.join(list2))
except:
break
