def assign_labels(sentences):
    """ 
    Assigns the majority class label to each sentence for each task.
    Returns two lists: predicted AC and predicted SP 
    """

    predictions_category = []
    predictions_sentiment = []

    for sentence in sentences:
        prediction_cat = 'NA'
        predictions_category.append(prediction_cat)

        prediction_sent = 'Neutral'
        predictions_sentiment.append(prediction_sent)
    
    return predictions_category, predictions_sentiment