#!/usr/bin/env python3
from collections import Counter
import sys

MOD = 998244353

def main():
    N = int(input(), 16)
    oc = format(N, "o")
    c = Counter(list(oc))
    mx = max(c.values())
    print(*sorted([k for k, v in c.items() if v == mx]), sep=" ")
    return

if __name__ == '__main__':
    main()