int main() {
  Person person;

  person.ChangeFirstName(1965, "Polina");
  person.ChangeLastName(1967, "Sergeeva");
  for (int year : {1900, 1965, 1990}) {
    cout << person.GetFullName(year) << endl;
  }

  person.ChangeFirstName(1970, "Appolinaria");
  for (int year : {1969, 1970}) {
    cout << person.GetFullName(year) << endl;
  }

  person.ChangeLastName(1968, "Volkova");
  for (int year : {1969, 1970}) {
    cout << person.GetFullName(year) << endl;
  }

  return 0;
}