interface Riggable {
    void rig();
    void unrig();
    boolean isRigged();
}

abstract class Vessel {
    double length;
    String meansOfPower;
    abstract void setMeansOfPower(String m);
}

class Boat extends Vessel {
    String name;
    void setMeansOfPower(String m) {meansOfPower = m;}
    void setLength(double len) {length = len;}
    public String toString() {return "the Vessel " + name; }
}

class Sailboat extends Boat implements Riggable {
    private int numberOfMasts;
    boolean rigged;
    void setMeansOfPower(String m) { super.setMeansOfPower("wind"); }
    void setName(String n) {name = n; }
    Sailboat() { setMeansOfPower(""); }
    Sailboat(String n) { setMeansOfPower(""); setName(n); }
    public void rig() { rigged = true; }
    public void unrig() { rigged = false; }
    public boolean isRigged() {return rigged;}
}

public class SailAway {
    public static void main(String []argv) {
        Vessel v = new Sailboat("HMS 341");
        ((Sailboat)v).rig();
	System.out.println(v.toString() + " is ready to cruise!");
    }
}