// Created by Julio Tentor <jtentor@fi.unju.edu.ar>
//
import java.lang.Comparable;

public class Person implements Comparable<Person> {
    private String lastname;
    private String firstname;

    public Person() {
        this("", "");
    }
    public Person(String lastname, String firstname) {
        this.lastname = lastname;
        this.firstname = firstname;
    }

    @Override
    public String toString() {
        return this.lastname +  ", " + this.firstname;
    }

    @Override
    public int compareTo(Person o) {
        return this.toString().compareTo(o.toString());
    }
}