f = [0] * 14
for x in map(int, input().split()):
    f[x] += 1

ans = []
for v in range(14):
    g = f[:]
    g[v] += 1
    g.sort()
    if g[-5:] == [2,3,3,3,3]:
        ans.append(v)
print(len(ans))
print(*ans)