class Person {
  String firstName;
  String lastName;
  int age;
  String email;

  Person() {
    firstName = "";
    lastName = "";
    age = 0;
    email = "";
  }
  
  Person(String fn, String ln, int a, String e) {
    firstName = fn;
    lastName = ln;
    age = a;
    email = e;
    System.out.println("DEBUG: in Person's constructor");
  }

  String about() {
    return firstName + " " + lastName + ", age " + age + " (" + email + ")";
  }
}