public class No18 {

	public static void main(String[] args) {
		java.util.Scanner s = new java.util.Scanner(System.in);
		String S = s.nextLine();
		s.close();

		char[] c = S.toCharArray();
		S = "";
		for(int i = 0;i < c.length;i++) {
			int ci = c[i] - ((i + 1) % 26);
			if(ci < 65) {
				ci += 26;
			}
			S = S + (char)ci;
		}

		System.out.println(S);
	}

}