def size_box(box):
    
   """Calculates the length and the height of a box.
   
   Arguments:
   box: boundaries of the box (left, top, right, bottom)

   Return:
   length_box: length of the box
   height_box: height of the box
   
   """
   length_box = box[2]-box[0]
   height_box = box[3]-box[1]
   
   return [length_box, height_box]