import java.util.Scanner;

public class Yukicoder18 {
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		char[] c = sc.next().toCharArray();
		for (int i = 0; i < c.length; i++)
			System.out.print((char) (c[i] - (i % 26) > 'A' ? c[i] - (i % 26) - 1 : c[i] - (i % 26) + 25));
	}
}