题解 | 提取不重复的整数

import sys
from collections import defaultdict

data = list(sys.stdin.read().strip())

data_rev = map(int, reversed(data))

dic = defaultdict(int)

for _ in data_rev:
    key = _
    dic[key] += 1

data_last = []

for _ in dic.keys():
    _ = str(_)
    data_last.append(_)
data_last = "".join(data_last)


print(data_last)