import java.util.Scanner;

public class Test {
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);

		String s = sc.next(), ans = "";
		char[] ch = s.toCharArray();

		for(int i = 0; i < ch.length; i++){
			ch[i] -= (i+1)%26;
			while(ch[i] < 'A'){
				ch[i] += 26;
			}
			ans += ch[i];
		}
		System.out.println(ans);
	}
}