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

class yc2
{
    static void Main()
    {
        string str1 = Console.ReadLine();

        for (int i = 0; i < str1.Length; i++)
        {
            Console.Write((char)(str1[i] - (i + 1) % 26 < 'A' ? str1[i] + 26 - (i + 1) % 26 : str1[i] - (i + 1) % 26));
            //Console.WriteLine((int)'Z');
        }
    }
}