using System;
using System.Collections;
using System.Collections.Generic;
using System.Diagnostics;
using System.IO;
using System.Linq;
using System.Numerics;
using System.Text;
using System.Text.RegularExpressions;
using System.Threading.Tasks;
using static System.Math;
public static class P
{
    public static void Main()
    {
        var s = Console.ReadLine().ToArray();
        var max = s.Max(x => x);
        var firstNotMaxPlace = s.TakeWhile(x => x == max).Count();
        var lastMaxPlace = s.Length - 1 - s.Reverse().TakeWhile(x => x != max).Count();
        if (firstNotMaxPlace < lastMaxPlace)
        {
            var tmp = s[firstNotMaxPlace];
            s[firstNotMaxPlace] = s[lastMaxPlace];
            s[lastMaxPlace] = tmp;
        }
        Console.WriteLine(string.Join("", s));
    }
}