public class Main {
    public static void main(String[] args) {
        // I - Works
        ClassC c = new ClassD();
        c.print("hello", "there");

        // II - Does not compile because class C is abstract
//        ClassA a = new ClassC();
//        a.print(1, "there")

        // III - Works
        ClassF a = new ClassF();
        a.print("hello", "there");
    }
}