package tutorial.base;

public class TypesTutorial {

    public static void main(String... args) {
        A alpha = new B();
    }
}

class A {
    A(){
        System.out.print("A");
        a();
    }
    
    void a() {
        System.out.print("a");
    }
}

class B extends A {
    B() {
        System.out.print("B");
        a();
    }
    
    void a() {
        System.out.print("b");
    }
}