from sys import stdin
from collections import Counter

N = stdin.readline().rstrip()
#cnt = [0] * 8
pool = []

def hex2oct(x):
    octnum = oct(int(x, base=16))[2:]
    for elem in octnum:
        pool.append(elem) 
        #ielem = ord(elem) - 48
        #cnt[ielem] += 1

for c in N:
    hex2oct(c)

res = []
c = Counter(pool)
d = c.most_common()
print(d, len(d))
mat = d[0][1]
for i in range(len(d)):
    if mat == d[i][1]:
        res.append(d[i][0])
    else:
        break

res.sort()
print(*res, end=' ')