using System;

namespace No._39
{
    class Program
    {
        static void Main(string[] args)
        {
            string number = Console.ReadLine();
            int result, max = 0;

            for (int i = 0; i < number.Length - 1; i++)
            {
                result = int.Parse(number.Substring(0, i) + MaxNumber(number.Substring(i)));
                if (max < result)
                    max = result;
            }

            Console.WriteLine(max);
        }

        static string MaxNumber(string number)
        {
            int pos = 0, max = int.Parse(number[0].ToString());
            string result;

            for (int i = 1; i < number.Length; i++)
                if (max <= int.Parse(number[i].ToString()))
                {
                    max = int.Parse(number[i].ToString());
                    pos = i;
                }

            result = number[pos].ToString();
            for (int i = 1; i < number.Length; i++)
                if (i == pos)
                    result += number[0].ToString();
                else
                    result += number[i].ToString();

            return result;
        }
    }
}