using System;
using System.Linq;

class Program
{
    static void Main(string[] args)
    {
        string s = Console.ReadLine();

        char[] chars = "ABCDEFGHIJKLMNOPQRSTUVWXYZ".ToCharArray();
        string[] arr = chars.Select(a => a.ToString()).ToArray();
        string ans = "";

        for (int i = 1; i <= s.Length; i++)
        {
            int a = Array.IndexOf(arr, s[i - 1].ToString());
            int b = a - i;

            while (b < 0)
            {
                b = b + 26;
            }

            ans += arr[b];
        }

        Console.WriteLine(ans);
        Console.Read();
    }
}