using System;
using static System.Console;
using System.Linq;
using System.Collections.Generic;

class Program
{
    static int NN => int.Parse(ReadLine());
    static int[] NList => ReadLine().Split().Select(int.Parse).ToArray();
    static int[][] NArr(long n) => Enumerable.Repeat(0, (int)n).Select(_ => NList).ToArray();
    public static void Main()
    {
        Solve();
    }
    static void Solve()
    {
        var s = ReadLine();
        var count = new int[9];
        foreach (var c in s) ++count[c - '1'];
        for (var i = 0; i < 9; ++i)
        {
            if (count[i] == 4) continue;
            var ncount = (int[]) count.Clone();
            ++ncount[i];
            if (Judge(ncount)) WriteLine(i + 1);
        }
    }
    static bool Judge(int[] count)
    {
        if (Judge2(count, true)) return true;
        for (var i = 0; i < 7; ++i)
        {
            --count[i];
            --count[i + 1];
            --count[i + 2];
            if (Judge2(count, false)) return true;
            for (var j = i; j < 7; ++j)
            {
                --count[j];
                --count[j + 1];
                --count[j + 2];
                if (Judge2(count, false)) return true;
                for (var k = j; k < 7; ++k)
                {
                    --count[k];
                    --count[k + 1];
                    --count[k + 2];
                    if (Judge2(count, false)) return true;
                    for (var l = k; l < 7; ++l)
                    {
                        --count[l];
                        --count[l + 1];
                        --count[l + 2];
                        if (Judge2(count, false)) return true;
                        ++count[l];
                        ++count[l + 1];
                        ++count[l + 2];
                    }
                    ++count[k];
                    ++count[k + 1];
                    ++count[k + 2];
                }
                ++count[j];
                ++count[j + 1];
                ++count[j + 2];
            }
            ++count[i];
            ++count[i + 1];
            ++count[i + 2];
        }
        return false;
    }
    static bool Judge2(int[] count, bool isAll)
    {
        if (count.Any(ci => ci < 0)) return false;
        var two = 0;
        var three = 0;
        var other = 0;
        foreach (var ci in count)
        {
            if (ci == 2) ++two;
            else if (ci == 3) ++three;
            else if (ci > 0) ++other;
        }
        if (other > 0) return false;
        if (isAll && two == 7) return true;
        if (two == 1) return true;
        return false;
    }
}