using System;

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

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

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

            Console.WriteLine(result);
        }
    }
}