from collections import Counter

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

def ok(arr):
    c = Counter()
    for v in arr: c[v] += 1
    return list(sorted([c[v] for v in c.keys()])) == [2, 3, 3, 3, 3]

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

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