import ch.aplu.turtle.*;
class serie2
{
Turtle pierre = new Turtle();
serie2()
  {
    int i = 0;            
    while (i < 4)         
{
     pierre.forward(100);   
     pierre.right(90);
      i++;               
    }
  }

  public static void main(String[] args)
  {
    new serie2();
  }
}