﻿class Person {

    void displayPerson() {
        System.out.println("Person Class");
    }
}

class Student extends Person {

    void displayStudent() {
        System.out.println("Student Class");
    }
}

class GraduateStudent
    extends Student {

    void displayGraduateStudent() {
        System.out.println("Graduate Student Class");
    }
}

public class ${CLASS_NAME} {

    public static void main(String[] args) {

        GraduateStudent student = new GraduateStudent();

        student.displayPerson();
        student.displayStudent();
        student.displayGraduateStudent();
    }
}