题解 | #提取不重复的整数#

import sys

num = int(input())

if num % 10 == 0:
    print("making sure the last number is not 0")

else:
    string = str(num)

temp_list = []
for n in range(len(string)):
    index = len(string) - n - 1    
    st = string[index]
    # print(st)

    if st not in temp_list:
        print(st, sep='', end='')
        temp_list.append(st)