using System;
using System.Collections.Generic;
using System.Linq;

namespace yukicode {
    public class Program {
        public static string Solver(System.IO.TextReader reader) {
            const string alphabet = "ABCDEFGHIJKLMNOPQRSTUVWXYZ";
            var s = reader.ReadLine();
            var sb = new System.Text.StringBuilder();
            for (var i = 1; i <= s.Length; ++i) {
                var p = alphabet.IndexOf( s[ i -1] )+1;
                var q = ( p > i % 26 ? 0 : 26 ) + p - i % 26-1;
                sb.Append( alphabet[ q ] );
            }
            return sb.ToString();
        }

        private static void Main() {
            Console.WriteLine( Solver( Console.In ) );
        }
    }

    public class MyLib {
        public static string Ordinalization(int num) {
            string surfix = "stndrdth";
            return string.Format( "{0}{1}", num,
                ( 0 < num % 10 && num % 10 <= 4 ) && ( ( num % 100 ) / 10 != 1 ) ?
                surfix.Substring( ( num % 10 - 1 ) * 2, 2 ) : surfix.Substring( 6 ) );
        }
        public static List<int> GetIntList(string input, char delimitor) {
            return input.Split( delimitor ).ToList<string>().ConvertAll<int>( int.Parse );
        }
        public static List<int> GetIntList(string input, char[] delimitors) {
            return input.Split( delimitors ).ToList<string>().ConvertAll<int>( int.Parse );
        }
    }
}