题解 | #提取不重复的整数#

num = int(input())
list = []
for i in range(10):
    a = num % 10 #a是最后一位数
    num = int(num/10)
    try:
        list.index(a)
    except:
        list.append(a)
        print(a,end='')
    if num == 0:
        break