import java.util.Scanner;

public class No00000018_Main {

	public static void main(String[] args) {

		Scanner scan = new Scanner(System.in);

		char[] charA = scan.nextLine().toCharArray();
		char[] charB = new char[charA.length];

		for(int i = 0; i < charA.length; i++) {
			charB[i] = (char)((charA[i] - (i + 1) + 'A') % 26 + 'A');
		}

		System.out.println(new String(charB));

		scan.close();

	}

}