code: def get_example():
      
      features = random.sample(string.ascii_letters, NUM_SAMPLES)
      num_capitalized = len([ letter for letter in features if letter in string.ascii_uppercase ])
      num_lowercase = len([ letter for letter in features if letter in string.ascii_lowercase ])
      if num_capitalized > num_lowercase:
          label = 1
      else:
          label = -1
      return (label, features)
docs: Make an example for training and testing.  Outputs a tuple
      (label, features) where label is +1 if capital letters are the majority,
      and -1 otherwise; and features is a list of letters.