from collections import Counter


def check(c: Counter):
    for i in range(1, 10):
        if c[i] >= 3:
            c2 = c.copy()
            c2[i] -= 3
            if check(c2):
                return True
        if c[i] and c[i+1] and c[i+2]:
            c2 = c.copy()
            c2[i] -= 1
            c2[i+1] -= 1
            c2[i+2] -= 1
            if check(c2):
                return True

    return c.most_common(2)[0][1] == 2 and c.most_common(2)[1][1] == 0


def solve():
    counter = Counter(map(int, input()))
    for i in range(1, 10):
        if counter[i] == 4:
            continue
        counter[i] += 1
        if all(v == 2 for v in counter.values() if v) or check(counter.copy()):
            print(i)
        counter[i] -= 1


if __name__ == "__main__":
    solve()