import java.util.*;
import java.io.*;
class Aaf {
  public static void main(String[] args){
    System.out.println("文字列を入力してください");
    Scanner scan = new Scanner(System.in);
    char [] str = scan.next().toCharArray();
    int i=0;
    for(i=0;i<str.length;i++){
      int a = (int)str[i];
      if(a<65&&a>82)
        break;
      a = a - i - 1;
      while(a<65)
        a=a+26;
      char c = (char)a;
      System.out.print(c);
    }
  }
}