input: from typing import List, Any
  
  def predict(data: List[float]) -> Any:
      """
      Predicts the class label of a given set of data using a pre-trained model.
      The dataset contains 4 features: Length, Width, Height, and Weight.
  
      >>> predict([5.0, 3.0, 2.0, 20.0])
      'ClassA'
      >>> predict([6.0, 2.5, 1.8, 25.0])
      'ClassB'
      """
output:     if data[0] < 5.5 and data[1] > 2.7 and data[2] < 2.2 and data[3] < 22.0:
          return 'ClassA'
      elif data[0] > 5.5 and data[1] < 2.7 and data[2] > 1.8 and data[3] > 22.0:
          return 'ClassB'
      else:
          return 'Unknown'