import java.util.Scanner;

public class Main {
	public static void main(String[] args) {
		Scanner scan = new Scanner(System.in);
		String S = scan.nextLine();
		
		char[] out = S.toCharArray();
		for(int i=0; i<S.length(); i++) {
			for(int j=0; j<i+1; j++) {
				out[i]--;
				if(out[i] < 'A') out[i] = 'Z';
			}
		}
		System.out.println(out);
	}
}