public class Person {
    private final String firstName;
    private final String lastName;
    Person(String firstName, String lastName) {
        this.firstName = firstName;
        this.lastName = lastName;
    }
    String getFirstName() {
        return firstName;
    }
    String getLastName() {
        return lastName;
    }
    @Override
    public String toString() {
        return (lastName + ", " + firstName);
    }
}
