import java.awt.Color;

public class Main {

    public static void main(String[] args) {
        StdDraw.setXscale(-2.0, 2.0);
        StdDraw.setYscale(-2.0, 2.0);
        StdDraw.setPenColor(Color.LIGHT_GRAY);
        StdDraw.line(-2, 0, 2, 0);
        StdDraw.line(0, 2, 0, -2);
        StdDraw.setPenColor(Color.BLACK);
        StdDraw.circle(0,0,1);
        StdDraw.filledCircle(1, 0, 0.03);
    }

}