using System;

namespace No018
{
    class Program
    {
        static void Main(string[] args)
        {
            string s = Console.ReadLine();

            for (int i = 0; i < s.Length; i++)
            {
                Console.Write(Uusa(s[i], i % 26));
            }
        }

        static char Uusa(char c, int n)
        {
            int a = c - (char)n - 1;
            if (a < 'A')
                a = 'Z' - ('A' - a) + 1;
            return (char)a;
        }
    }
}