input: def predict(data):
      """
      Develop a Python function to predict the class labels of a given set of data.
      The dataset contains 4 features: Length, Width, Height and Weight.
      >>> predict([5.0, 2.0, 3.0, 1.0])
      ['A']
      >>> predict([1.0, 1.0, 1.0, 1.0])
      ['B']
      """
output:     if data[0] > 3.0 and data[1] > 1.5 and data[2] > 2.5 and data[3] > 0.5:
          return ['A']
      else:
          return ['B']