import java.util.Arrays;
import java.util.Scanner;

public class Main {
	
	public static void main(String[] args){
		Scanner sc = new Scanner(System.in);
		
		final int SIZE = 'Z' - 'A' + 1;
		
		char[] S = sc.next().toCharArray();
		
		StringBuilder answer = new StringBuilder();
		for(int i = 0; i < S.length; i++){
			final int transed = S[i] - 'A';
			int orig = transed - ((i + 1) % SIZE);
			if(orig < 0){
				orig += SIZE;
			}else if(orig >= SIZE){
				orig -= SIZE;
			}
			
			answer.append((char)(orig + 'A'));
		}
		
		System.out.println(answer);
	}
	
}