n = input()
l = ["A","B","C","D","E","F"]
# m進数を10進数に変換
def m_to_ten(n,m):
    res = 0
    cnt = 0
    for i in range(len(n)):
        res += m ** cnt * (l.index(n[-(i+1)])+10)
        cnt += 1
    return res
# 10進数をm進数に変換
def ten_to_m(n,m):
    res = 0
    cnt = 0
    while n > 0:
        res += (n % m) * 10 ** cnt
        n = n // m
        cnt += 1
    return res
ans = str(ten_to_m( m_to_ten(n,16),8))
from collections import Counter
c = Counter(ans)
max_ = max(c.values())
ans_l = []
for k in c.keys():
    if c[k] == max_:
        ans_l.append(k)
ans_l.sort()
print(*ans_l)