import java.util.Scanner;

public class Main{
	public static void main(String[] args){
		Scanner sc=new Scanner(System.in);
		while(sc.hasNext()){
			String str=sc.next();
			for(int i=0;i<str.length();i++){
				int t=str.charAt(i)-'A'-i+25+26*100;
				t%=26;
				System.out.print((char)(t+'A'));
			}
			System.out.println();
		}
	}
}