public abstract class Human implements Nameable {
	
	private String fn, ln, mn;
	private double age;
	
	public Human(String fn, String ln, String mn, double age ) {
		this.fn=fn; this.ln=ln; this.mn=mn; this.age=age;
	}
	public String toString() {
		return this.fn + " " + this.ln + ", age: " + this.age + " years.";
	}
	@Override
	public String getFirstName() {
		return this.fn;
	}
	@Override
	public String getLastName() {
		return this.ln;
	}
	@Override
	public String getMiddleName() {
		return this.mn;
	}
	@Override
	abstract public String getTitle();
	
}