def base10to(n, b):
    if (int(n/b)):
        return base10to(int(n/b), b) + str(n%b)
    return str(n%b)

s = input()
li = [0]*10
for i in range(len(s)):
    li[int(s[i])] += 1

s = li[:]

num = 2**4
ans = set()
for i in range(1,10):
    s = li[:]
    if s[i] == 4:
        continue
    s[i] += 1
    ori = s[:]
    f = True
    for j in range(10):
        if s[j] != 0 and s[j] != 2:
            f = False
           
    if f == True:
        ans.add(i)
        continue

    for j in range(1,10):
        s = ori[:]
        if s[j] >= 2:
            s[j] -= 2
        else:
            continue
        ori2 = s[:]
        for k in range(num):
            s = ori2[:]
            tmp = str(base10to(k,2)).zfill(4)
            for l in range(4):
                if tmp[l] == "0":
                    for m in range(1,10):
                        if s[m] >= 3:
                            s[m] -= 3
                            break
                if tmp[l] == "1":
                    for m in range(1,8):
                        if s[m] >= 1 and s[m+1] >= 1 and s[m+2] >= 1:
                            s[m] -= 1
                            s[m+1] -= 1
                            s[m+2] -= 1
                #if tmp[l] == "2":
                #    for m in range(3,10):
                #        if s[m-2] >= 1 and s[m-1] >= 1 and s[m]

            if sum(s) == 0:
                ans.add(i)
                break

    

ans = list(ans)
ans.sort()
for i in range(len(ans)):
    print(ans[i])