code: def sort(line):
      x0, y0, x1, y1 = line
      turn = False
      if abs(x1 - x0) > abs(y1 - y0):
          if x1 < x0:
              turn = True
      elif y1 < y0:
          turn = True
      if turn:
          return (x1, y1, x0, y0)
      return line