import java.awt.*;
import java.awt.event.*;
public class Liigu1 extends Frame implements MouseMotionListener{
  public Liigu1(){
    setSize(300, 300);
    setVisible(true);
    addMouseMotionListener(this);
  }
  public void mouseMoved(MouseEvent e){}
  public void mouseDragged(MouseEvent e){
    Graphics g=this.getGraphics();
    g.setColor(Color.white);
    g.fillRect(0, 0, getSize().width, getSize().height);
    g.setColor(Color.black);
    g.drawOval(e.getX()-5, e.getY()-5, 10, 10);
  }
  public static void main(String argumendid[]){
    new Liigu1();
  }
}