import java.util.Scanner;


public class Main {
	public static void main(String[] a) {
		Scanner s=new Scanner(System.in);
		char[] C=s.next().toCharArray();
		for(int i=0;i<C.length;i++)C[i]=(char)(((C[i]-66-i)%26+26)%26+65);
		System.out.println(String.valueOf(C));
	}
}