public interface Shape
{
    public abstract double area();
}

public class Circle implements Shape
{
    private double radius;

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

    public void setRadius(double radius)
    {
        this.radius = radius;
    }

    public double getRadius()
    {
        return radius;
    }

    public double area(double radius)
    {
        return getRadius()*getRadius()*3.14;
    }

}

public class Rectangle implements Shape
{
    private double length;
    private double width;

    public void setLength(double length)
    {
        this.length = length;
    }

    public void setWidth(double width)
    {
        this.width = width;
    }

    public double getLength()
    {
        return length;
    }

    public double getWidth()
    {
        return width;
    }

    public double area()
    {
        return getLength()*getWidth();
    }
}