Question: how many characters are in the prologue of canterbury tales
[{'answer': 'some thirty pilgrims'}, {'provenance': [{'wikipedia_id': '7627', 'title': 'The Canterbury Tales', 'start_paragraph_id': 5, 'start_character': 0, 'end_paragraph_id': 5, 'end_character': 568, 'bleu_score': 0.861078577064828, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 4966615278115373929}, 'section': 'Section::::Abstract.'}]}]