using System;

class Program
{
    static void Main()
    {
        var s = Console.ReadLine();
        string result = "";
        for(int i = 0; i < s.Length; i++)
        {
            int j = (int)s[i] - i - 1;
            while(j < 'A')
            {
                j += 26;
            }
            while('Z' < j)
            {
                j -= 26;
            }
            result += ((char)j).ToString();
        }
        Console.WriteLine($"{result}");
    }
}