using System;
using System.Linq;
using System.Collections.Generic;

namespace Algorithm
{
    class Program
    {
        static void Main(string[] args)
        {
            var X = Console.ReadLine();
            var dict = new Dictionary<char, int>();
            for (var i = 0; i < X.Length; i++)
            {
                if (dict.ContainsKey(X[i]))
                    dict[X[i]]++;
                else
                    dict[X[i]] = 1;
            }

            var count = 0;
            var one = 0;
            var ans = "";
            foreach (var d in dict.OrderBy(z => z.Key))
            {
                if (count == 0)
                    one = d.Value;

                ans = new string(d.Key, d.Value) + ans;
                count++;
            }

            if (X.Length == one)
            {
                Console.WriteLine(-1);
                return;
            }

            var work = ans.ToCharArray();
            Swap(ref work[work.Length-one], ref work[work.Length-one - 1]);
            var last = new string(work);

            if (last[0] == '0' || ans == last)
                Console.WriteLine(-1);
            else
               Console.WriteLine(last);
        }

        public static void Swap<T>(ref T one, ref T two)
        {
            var temp = one;
            one = two;
            two = temp;
        }
    }
}