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

public class Hello
{
    public static void Main()
    {
        var a = Console.ReadLine().Trim().ToArray();
        var ans = getAns(a);
        Console.WriteLine(ans);
    }
    public static int getAns (char[] a)
    {
        var aL = a.Length;
        var ans = new List<int>();
        ans.Add(int.Parse(new string(a)));
        for (int i = 0; i < aL; i++)
            for (int j = i + 1; j < aL; j++)
            {
                if (a[i] > a[j]) continue;
                swap(a, i, j);
                var t = new string(a);
                ans.Add(int.Parse(t));
                swap(a, i, j);
            }
        return ans.Max();
    }
    public static void swap (char[] a, int n , int m)
    {
        var w = a[n];
        a[n] = a[m];
        a[m] = w;
    }
}