import java.util.Scanner;
public class Q4
{
    public static void main(String[] args)
    {
     Scanner in = new Scanner(System.in);
     System.out.println("Circle?");
     System.out.println("Square?");
     System.out.println("Rectangle?");
     System.out.println("Exit?");

    String x = in.nextLine();

    if (x.equals ("Circle"))
    {
        System.out.print("What is the radius: ");
                double radius = in.nextDouble();
                System.out.println("Area is: " + Math.PI * Math.pow(radius, 2));
    }
                else
    if (x.equals ("Square"))
    {
     System.out.print ("What is the length: ");
     double length = in.nextDouble();
     System.out.println ("Area is: " + length * length);
    }
                else
        if (x.equals ("Rectangle"))
        {
            System.out.print ("What is the length: ");
            double length2 = in.nextDouble();
            System.out.print ("What is the width: ");
            double width = in.nextDouble();
            System.out.println ("Area is: " + length2 * width);
        }
    else
            if (x.equals ("Exit"))
            {
                System.out.println("Exit.");
        }
    }
}