import java.util.*;

public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        char[] arr = sc.next().toCharArray();
        for (int i = 0; i < arr.length; i++) {
            int next = (arr[i] - 'A' - (i + 1) + (i + 1) * 26) % 26;
            arr[i] = (char)(next + 'A');
        }
        System.out.println(arr);
    }
}