using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.IO;


namespace StartFinish
{
	class Program
	{
		static void Main(string[] args)
		{
            char[] ch = Console.ReadLine().ToArray();
            for(int i = 0; i < ch.Length; i++)
            {
                ch[i] = ((char)(ch[i] - i-1));
                Console.Write(ch[i]);
            }
            Console.WriteLine();
            
            

        }
    }
	
}