import java.util.Scanner;

public class Main{

	static final Scanner s=new Scanner(System.in);

	public static void main(String args[]){
		char in[]=s.next().toCharArray();
		for(int i=0;i<in.length;i++) {
			in[i]+=2599-'A'-i;
			in[i]%=26;
			in[i]+='A';
		}
		System.out.println(String.valueOf(in));
	}
}