import java.util.Scanner;

class main{
    public static void main(String args[]){
	Scanner scan = new Scanner(System.in);
	String str = scan.next();

	char c = 'A';

	String wooser = "";

	for(int i = 0; i < str.length(); i++){
	    int no = i + 1;

	    char ch = str.charAt(i);

	    ch -= no;

	    while(true){
		if((int)ch < 65){
		    ch += 26;
		}
		else{
		    break;
		}
	    }

	    String str_ch = String.valueOf(ch);

	    wooser = wooser + str_ch;

	}
	
	System.out.println(wooser);
	
    }
    
}