package ru.ref;

/**
 * Hello world!
 */
public class App {

    public class A1 {
    }

    public class A2 extends A1 {
    }

    public class A3 extends A2 {
    }

    public class A4 extends A3 {
    }

    public class A5 extends A4 {
    }

    public static void main(String[] args) {
        Class cls = A5.class;
        while (cls != null) {
            System.out.println(cls.toString());
            cls = cls.getSuperclass();
        }
    }
}