using System.Diagnostics;
using System.Numerics;

public class Program
{
    public static void Main()
    {

        //int num = int.Parse(Console.ReadLine() ?? string.Empty);
        //string[] str = (Console.ReadLine() ?? string.Empty).Trim().Split(' ');
        string str = Console.ReadLine() ?? string.Empty;

        if (str[str.Length - 1] == '1')
        {
            str = str.Substring(0, str.Length - 1) + "0";
            Console.WriteLine(str);
        }
        else
        {
            str = str.Substring(0, str.Length - 1) + "1";
            Console.WriteLine(str);
        }

    }
}