import java.util.Scanner;


public class Main_yukicoder18 {

    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);

        char[] s = sc.next().toCharArray();
        for (int i = 0; i < s.length; i++) {
        	s[i] = (char)((s[i] - 'A' - i - 1 + 26 * 1024) % 26 + 'A');
        }

        System.out.println(new String(s));

        sc.close();
    }
}