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++)
        {
            if (str1[i] - (i+1) % 26 < 'A')
            {
                Console.Write((char)(str1[i] + (26 - (i+1) % 26)));
            }
            else
            {
                Console.Write((char)(str1[i] - (i+1) % 26));
            }
        }
    }
}