class Person {
    String firstName;
    String lastName;
    int yearOfBirth;

    static boolean isUpperCase;

    Person(String firstName_, String lastName_, int yearOfBirth_) {
        firstName = firstName_;
        lastName = lastName_;
        yearOfBirth = yearOfBirth_;
    }

    boolean isAdult(int year) {
        return year - yearOfBirth >= 18; // true or false
    }

    public String toString() {
        if (isUpperCase)
            return firstName.toUpperCase()
                 + " "
                 + lastName.toUpperCase();
        else
            return firstName + " " + lastName;
    }
}