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

def ok(S):
    cnt = [0] * 10
    for s in S:
        cnt[s] += 1
    if all(c in [0, 2] for c in cnt):
        return True
    if any(c >= 5 for c in cnt):
        return False
    
    def dfs(i):
        if i == 5:
            return True
        if i == 0:
            for j in range(1, 10):
                if cnt[j] >= 2:
                    cnt[j] -= 2
                    if dfs(i + 1):
                        return True
                    cnt[j] += 2
        else:
            for j in range(1, 10):
                if cnt[j] >= 3:
                    cnt[j] -= 3
                    if dfs(i + 1):
                        return True
                    cnt[j] += 3
            for j in range(3, 10):
                if cnt[j] >= 1 and cnt[j - 1] >= 1 and cnt[j - 2] >= 1:
                    cnt[j] -= 1
                    cnt[j - 1] -= 1
                    cnt[j - 2] -= 1
                    if dfs(i + 1):
                        return True
                    cnt[j] += 1
                    cnt[j - 1] += 1
                    cnt[j - 2] += 1
            
        return False
    
    return dfs(0)


for i in range(1, 10):
    S.append(i)
    if ok(S[:]):
        print(i)
    S.pop()