import java.util.*;

class No0013{
	public static void main(String[] args){
		Scanner sc = new Scanner(System.in);
		String s = sc.next();
		char[] st = new char[s.length()];

		for(int i = 0; i < s.length(); i++){
			st[i] = s.charAt(i);
			st[i] -= i + 1;
			if(st[i] < 'A') st[i] += 26;
			if(st[i] > 'Z') st[i] -= 26;
			System.out.print(st[i]);
		}
		System.out.println();
	}
}