from collections import Counter, defaultdict


def Base_10_to_n(X, n):
    X_dumy = X
    out = ''
    while X_dumy>0:
        out = str(X_dumy%n)+out
        X_dumy = int(X_dumy/n)
    return out

def Base_n_to_10(X,n):
    out = 0
    for i in range(1,len(str(X))+1):
        out += int(X[-i], 16)*(n**(i-1))
    return out#int out

s = input()[::-1]
n = len(s)
d = defaultdict(int)
for i in range(0, n, 3):
	t = s[i * 3 : i * 3 + 3]
	num = Base_10_to_n(Base_n_to_10(t, 16), 8)
	for j in num:
		d[j] += 1
c = Counter(d).most_common()
m = max(d.values())
ans = []
for i, v in c:
	if v == m:
		ans.append(i)
	else:
		break
print(*sorted(ans))