using System;using System.Text;using System.Linq;using System.IO;namespace N{class P{static void Main(){string CSL=Console.ReadLine();StringBuilder Sb=new StringBuilder();int lng=CSL.Length;for(int i=0;i<lng;i++){int n=CSL[i]-65+2600;n=n-(i+1);n=n%26;n+=65;Sb.Append((char)n);}Console.WriteLine(Sb.ToString());}}}