from collections import Counter

N = list(input())

oct_count = Counter()
while N:
    value_str = ""
    for _ in range(3):
        value_str += N.pop()
        if not N:
            break
    oct_count += Counter(oct(int(value_str, base=16))[2:])

max_count = max(oct_count.values())
ans = []
for key, value in oct_count.items():
    if value == max_count:
        ans.append(key)
print(*sorted(ans))