def check(l):
    if max(l) < 5:
        if l.count(2) == 7:
            return True
    
        for i in range(1, 10):
            l2 = l[:]
            if l2[i] >= 3:
                l2[i] -= 3
                if check(l2):
                    return True
                l2[i] += 3
        
        for i in range(1, 8):
            if l2[i] and l2[i+1] and l2[i+2]:
                l2[i] -= 1
                l2[i+1] -= 1
                l2[i+2] -= 1
                if check(l2):
                    return True
                l2[i] += 1
                l2[i+1] += 1
                l2[i+2] += 1
        
            if sum(l2) == 2 and max(l2) == 2:
                return True


s = list(map(int,input()))

for i in range(1, 10):
    t = s[:]
    t = t + [i]
    
    l = [0] * 10
    for i in t:
        l[i] += 1
    # print(l)
    
    if check(l) == True:
        print(i)