import sys
# input = lambda :sys.stdin.readline()[:-1]
ni = lambda :int(input())
na = lambda :list(map(int,input().split()))
yes = lambda :print("yes");Yes = lambda :print("Yes");YES = lambda : print("YES")
no = lambda :print("no");No = lambda :print("No");NO = lambda : print("NO")
#######################################################################

def check(a):
    b = [0] * 10
    for i in a:
        b[i] += 1
    c = 0
    d = 0
    for i in range(10):
        if b[i] == 3:
            c += 1
        elif b[i] == 2:
            d += 1
    return c == 4 and d == 1

a = na()
ans = []
for i in range(10):
    if check(a + [i]):
        ans.append(i)

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