import itertools

def check(A):
    N=len(A)
    if N==0:
        return True
    if N==3:
        A=sorted(A)
        return {b-a for a,b in zip(A,A[1:])} in ({0},{1})
    if N==14:
        for i in range(N):
            for j in range(i+1,N):
                if A[i]==A[j] and check([A[k] for k in range(N) if not k in (i,j)]):
                    return True
        A=sorted(A)
        if all(a==b for a,b in zip(A[::2],A[1::2])) and len(set(A))==7:
            return True
    else:
        for tpl in itertools.combinations(range(N),3):
            if check([A[i] for i in tpl]) and check([A[k] for k in range(N) if not k in tpl]):
                return True
    return False
S=[int(s) for s in input()]
for ans in range(1,10):
    if check(S+[ans]) and S.count(ans)<=3:
        print(ans)