import java.util.*;
import java.io.*;

public class Main {
	public static void main(String[] args) throws Exception {
		new Main().run();
	}

	boolean check2(int[] cnt) {
		boolean zero = true;
		for (int v : cnt) {
			zero &= v == 0;
		}
		if (zero)
			return true;
		int p = 0;
		while (cnt[p] == 0)
			++p;
		boolean ret = false;
		if (cnt[p] >= 3) {
			cnt[p] -= 3;
			ret |= check2(cnt);
			cnt[p] += 3;
		}
		if (p + 2 <= cnt.length - 1 && cnt[p] > 0 && cnt[p + 1] > 0 && cnt[p + 2] > 0) {
			--cnt[p];
			--cnt[p + 1];
			--cnt[p + 2];
			ret |= check2(cnt);
			++cnt[p];
			++cnt[p + 1];
			++cnt[p + 2];
		}
		return ret;
	}

	boolean check(int num, int[] s) {
		int[] a = new int[s.length + 1];
		for (int i = 0; i < s.length; ++i) {
			a[i] = s[i];
		}
		a[a.length - 1] = num;
		Arrays.sort(a);
		int[] cnt = new int[10];
		for (int v : a) {
			++cnt[v];
		}
		boolean flag = true;
		for (int v : cnt) {
			flag &= v == 2 || v == 0;
		}
		if (flag) // FF, GG, HH, II, JJ, KK, LL型
			return true;
		boolean ret = false;
		for (int i = 0; i <= 9; ++i) {
			if (cnt[i] >= 2) {
				cnt[i] -= 2;
				ret |= check2(cnt);
				cnt[i] += 2;
			}
		}
		return ret;
	}

	void run() throws Exception {
		Scanner sc = new Scanner(System.in);
		char[] cs = sc.next().toCharArray();
		int[] s = new int[cs.length];
		for (int i = 0; i < cs.length; ++i) {
			s[i] = cs[i] - '0';
		}
		Arrays.sort(s);

		for (int i = 1; i <= 9; ++i) {
			int cnt = 0;
			for (int v : s) {
				if (v == i)
					++cnt;
			}
			if (cnt >= 4)
				continue;
			if (check(i, s)) {
				System.out.println(i);
			}

		}
	}

	void tr(Object... objects) {
		System.out.println(Arrays.deepToString(objects));
	}

}