import ch.aplu.turtle.*;
import java.awt.Color;

class s72
{
  s72()
  {
    Turtle pierre = new Turtle();  
    Turtle luc = new Turtle();  
    luc.setColor(Color.red);
    luc.setPenColor(Color.green);

    for (int i = 0; i < 5; i++)
    {
      square(pierre);     
      pierre.forward(30);
      square(luc);    
      luc.forward(30); 
    }
  }

  void square(Turtle t)
  {
    for (int i = 0; i < 4; i++)
    {
      t.forward(30);
      t.right(90);
    }
  }

  public static void main(String[] args)
  {
    new s72();
  }
}