from collections import defaultdict

A = list(map(int, input().split()))

def func(B):
    D = defaultdict(int)
    for b in B:
        D[b] += 1
    D = sorted(D.values())
    return D == [2, 3, 3, 3, 3]

ans = []
for i in range(1, 10):
    if func(A+[i]):
        ans.append(i)

print(len(ans))
print(*ans)