using System;

namespace prob018
{
    class Program
    {
        static void Main(string[] args)
        {
            string s = Console.ReadLine();
            string ret = "";
            int tmp;
           
            for (int i = 0; i < s.Length; i++)
            {
                tmp= s[i] - (i+1);
                while (tmp<65)
                {
                    tmp = tmp + 26;
                }
                ret += (char)tmp;
            }
            Console.WriteLine(ret);
        }
    }
}