public class Main {
    public static void main(String[] args) {
        Person p = new Person("小明", 12);
        Student s = new Student("小红", 20, 99);
        Student ps = new PrimaryStudent("小军", 9, 100, 5);
        System.out.println(ps.getScore());
    }
}

class Person {
    protected String name;
    protected int age;

    public Person(String name, int age) {
        this.name = name;
        this.age = age;
    }

    public String getName() { return name; }
    public void setName(String name) { this.name = name; }

    public int getAge() { return age; }
    public void setAge(int age) { this.age = age; }
}

class Student extends Person {
    protected int score;

    public Student(String name, int age, int score) {
        super(name, age);
        this.score = score;
    }

    public int getScore() { return score; }
}
class PrimaryStudent extends Student
{
	protected int grade;
	//构造方法
	public PrimaryStudent(String name,int age,int score,int grade)
	{
		super(name,age,score);
		this.grade = grade;
	}
	public int getGrade()
	{
		return this.grade;
	}
}