using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.IO;

namespace ConsoleApplication1
{
    class Program
    {
        static void Main(string[] args)
        {
            int n=0;
            int[] mas = new int[50];
            string s,a1,a2=" ";
            s = Console.ReadLine();
            int p = s.Length;
            for (int i = 0; i < p; i++)
            {
                mas[i] = s[i]-48;
            }
            for(int i=0;i<p;i++)
                for(int j=i;j<p;j++)
                    if(mas[i]>mas[j])
                    {
                        int u=mas[i];
                        mas[i] = mas[j];
                        mas[j] = u;
                    }
            for (int i = 0; i < p; i++)
                if (mas[i] == 0)
                    n++;
            if (p-n-1<1)
            {
                a1 = "-1";
                a2 = " -1";
            }
            else
            {
                if (n == 0)
                {
                    a1 = Convert.ToString(mas[0]);
                    for (int i = 1; i < p; i++)
                        a2 = a2 + Convert.ToString(mas[i]);
                }
                else
                {
                    a1 = Convert.ToString(mas[n]);
                    mas[n] = 0;
                    a2 = a2 + mas[n+1];
                    for (int i = n; i > 0; i--)
                        a2 = a2 + mas[i];
                    for (int i = n+2; i < p; i++)
                        a2 = a2 + mas[i];

                }
            }
            Console.WriteLine("{0}{1}",a1,a2);

        }
    }
}