import java.util.*;

public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        String S = sc.next();
        byte [] u = S.getBytes();
        for(int i=0; i<u.length; i++){
            int d = u[i] - (i+1);
            while(d<65){
                d = d+26;
            }
            char c = (char)d;
            System.out.print(c);
        }
        System.out.println();
    }
}