import ch.aplu.turtle.*;
class serie2b
{
Turtle pierre = new Turtle();
serie2b()
  {
    for (int i = 0; i < 4; i++)
    {
      pierre.forward(100);
      pierre.right(90);
    }
  }

public static void main(String[] args)
 {
    new serie2b();
  }
}