interface CanFight {
    void fight();
}
interface CanSwim {
    void swim();
}
interface CanFly {
    void fly();
}

class ActionCharacter {
    public void fight() {}
}

class Hero extends ActionCharacter implements CanFight, CanSwim, CanFly {
    public void swim() {}
    public void
 
 fly() {}
}

public class Adventure {
    static void t(CanFight x) { x.fight(); }
    static void u(CanSwim x) { x.swim(); }
    static void v(CanFly x) { x.fly(); }
    static void w(ActionCharacter x) { x.fight(); }
    public static void main(String[] args) {
        Hero i = new Hero();
        t(i); 
 
// Treat it as a CanFight
        u(i); // Treat it as a CanSwim
        v(i); // Treat it as a CanFly
        w(i); // Treat it as an ActionCharacter
    }
}