import java.util.Scanner;

public class Main {
	public static void main(String[] args){
		Scanner scanner = new Scanner(System.in);
		String S = scanner.next();
		for(int i = 0;i < S.length();i++){
			if((char)(S.charAt(i)-(i+1)%26) < 'A') {
				System.out.print( (char)(S.charAt(i)-(i+1)%26+26));
			}else{
				System.out.print( (char)(S.charAt(i)-(i+1)%26));
			}
		}
		System.out.println();
		scanner.close();
	}
}