class AA
{
    int i=10;
    void method()
    {
        System.out.println("AA "+i);
    }
}
class BB extends AA
{
    int i = 20;
    void method()
    {
         AA a = new BB();
        System.out.println("BB  "+a.i);
    }
}
public class MainClass
{
    public static void main(String[] args)
    {
        AA a = new BB();
        BB b = new BB();
       a.method();
       b.method();
        System.out.println(a.i);
        System.out.println(b.i);
    }
}