import java.util.*;
class y18 {
    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]-66-i)%26+26)%26+65);
        }
        System.out.println(String.valueOf(s));
    }
}