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

class Program
{
    static int NN => int.Parse(ReadLine());
    static long[] NList => ReadLine().Split().Select(long.Parse).ToArray();
    public static void Main()
    {
        Solve();
    }
    static void Solve()
    {
        var x = ReadLine().ToList();
        var zeros = 0;
        foreach (var xi in x) if (xi == '0') ++zeros;
        if (zeros + 1 == x.Count)
        {
            WriteLine(-1);
        }
        else
        {
            x.Sort((l, r) => r.CompareTo(l));
            if (x[0] == x[^1])
            {
                WriteLine(-1);
                return;
            }
            for (var i = x.Count - 2; i >= 0; --i)
            {
                if (x[i] != x[i + 1])
                {
                    (x[i], x[i + 1]) = (x[i + 1], x[i]);
                    break;
                }
            }
            WriteLine(string.Concat(x));
        }
    }
}