class Top {
    public Top(String s) { System.out.print("B"); }
}

public class Bottom2 extends Top {
    public Bottom2(String s) { System.out.print("D"); }

    public static void main(String [] args) {
        new Bottom2("C");
        System.out.println(" ");
    }
}
//what does it mean to have:
//an implied super() call in Bottom2's constructor?