using System; 

namespace Yukicoder
{
    class Usacord{
        static void Main(string[] args){
            char[] characters = Input();
            String Result = Processing(characters);
            Console.WriteLine(Result);
        }

        static char[] Input(){
            char[] characters = Console.ReadLine().ToCharArray();
            return characters;
        }

        static String Processing(char[] characters){
            int Number = 0;
            String Count = "";
            for(int i = 0; i < characters.Length; i++){
                Number = (int)characters[i] - i % 26 - 1;
                if(Number < 65) {
                    Number = 90 - 64 + Number;
                }
                Count += (char)Number;   
            }
            return Count;
        }
    }
}