public class Main {
    public static void main(String[] args) {
        int x = 15;
        int y = 10;
        String result;

        if (x > y) {
            if (x % y == 0) {
                result = "A";
            } else {
                result = "B";
            }
        } else if (x < y) {
            result = "C";
        } else {
            result = "D";
        }

        System.out.println(result);
    }
}