import java.util.*;

class Main {
	static Scanner sc = new Scanner(System.in);
	public static void main(String[] args) {
		
		String s = sc.next();
		StringBuilder ans = new StringBuilder();
		for (int i=0; i<s.length(); i++) {
			char c = s.charAt(i);
			c -= i+1;
			if (c < 65) c += 26;
			ans.append(c);
		}
		System.out.println(ans);
	}
}