import java.util.Scanner;

public class Main {	
	public String changeStr(String s){
		char[] c = s.toCharArray();
		for(int i = 0;i < s.length();i++){
			c[i] = (char)(c[i] - (i + 1));
			while(c[i] < 'A'){
				c[i] += 26;
			}
		}
		return String.valueOf(c);
	}

	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		Main m = new Main();
		String str = sc.next();
		System.out.println(m.changeStr(str));
		
	}
}