// has_a3 DIS
// a reference as an instance variable
// use methods

class Person {
    int k;
    Person a;
    void print(Person p) {
	System.out.println(p.k);
    }

}

public class has_a3 {
    public static void main(String[] args) {
	
	Person x = new Person();
	Person y = new Person();
	y.k=2;
	x.a = y;
	
	x.print(y);
	y.print(x.a);

    }

}

/* output
2
2
*/