class Shape {
    public void draw() {
        System.out.println("Drawing a shape");
    }
}

class Circle extends Shape {
    @Override
    public void draw() {
        System.out.println("Drawing a circle");
    }
}

class Rectangle extends Shape {
    @Override
    public void draw() {
        System.out.println("Drawing a rectangle");
    }
}

public class ShapeDemo {
    public static void drawShape(Shape s) {
        s.draw();
    }
    
    public static void main(String[] args) {
        Shape shape = new Shape();
        Circle circle = new Circle();
        Rectangle rectangle = new Rectangle();
        
        System.out.println("Testing Shape:");
        drawShape(shape);
        
        System.out.println("\nTesting Circle:");
        drawShape(circle);
        
        System.out.println("\nTesting Rectangle:");
        drawShape(rectangle);
    }
}