import java.util.*;

public class Main {
    public static void main(String[] args){
        Scanner sc=new Scanner(System.in);
        String word=sc.next();
        
        String[] alphabet={"A","B","C","D","E","F","G","H","I","J","K","L","M","N","O","P","Q","R","S","T","U","V","W","X","Y","Z"};
        //System.out.println(alphabet.length);=>26でした
        List<String> list=Arrays.asList(alphabet);
        //System.out.println(list.indexOf("B"));
        String[] letters=word.split("");
        for(int i=0;i<letters.length;i++){
            int index=list.indexOf(letters[i])-(i+1);
            while(index<0){
                index+=26;
            }
            System.out.print(list.get(index));
        }
    }
}