input: 
  def predict_class(data):
      """ Predict the class label of a given set of data.
      The dataset contains 4 features: Length, Width, Height, and Weight.
      >>> predict_class([10.0, 5.0, 3.0, 2.0])
      [2]
      >>> predict_class([15.0, 7.0, 4.0, 3.0])
      [1]
      """
  
output:     if data[0] > 12.0 and data[1] > 6.0 and data[2] > 3.5 and data[3] > 2.5:
          return [1]
      else:
          return [2]