import java.util.Scanner;

abstract class Shape {

    abstract double calculateArea();
}

class Rectangle extends Shape {

    double length;
    double width;

    Rectangle(double length, double width) {
        this.length = length;
        this.width = width;
    }

    double calculateArea() {
        return length * width;
    }
}

class Circle extends Shape {

    double radius;

    Circle(double radius) {
        this.radius = radius;
    }

    double calculateArea() {
        return Math.PI * radius * radius;
    }
}

class RecCircleAbstract {

    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);

        System.out.print("Enter rectangle length: ");
        double length = scanner.nextDouble();
        System.out.print("Enter rectangle width: ");
        double width = scanner.nextDouble();

        Rectangle rectangle = new Rectangle(length, width);
        System.out.println("Rectangle area: " + rectangle.calculateArea());

        System.out.print("Enter circle radius: ");
        double radius = scanner.nextDouble();

        Circle circle = new Circle(radius);
        System.out.println("Circle area: " + circle.calculateArea());

        scanner.close();
    }
}