R=range
I=input
J=lambda:list(map(int,I().split()))
A=J()
def c():
	C=[0]*10
	for a in A:C[a]+=1
	D=[0]*10
	for c in C:D[c]+=1
	return D[3]==4 and D[2]==1
E=[]
for i in R(1,10):
	A+=[i]
	if c():E+=[i]
	A.pop()
print(len(E))
print(*E)