interface x{
    void display();
}

interface y extends x{
    void show();
}

class a implements y{
    public void display(){
        System.out.println("Hello");
    }
    public void show(){
        System.out.println("Welcome");
    }
}

public static void main(String args[]){
    a obj = new a();
    obj.display();
    obj.show();
}