n = str(input())
n = int(n,16)
n = oct(n)
#print(n)
n = n[2:]
#print(n)
from collections import Counter
C = Counter(n)
M = max(list(C.values()))
C = list(C.items())
ans = []
for k, v in C:
    if v == M:
        ans.append(k)
ans.sort()
print(*ans)