Question: how many hawaiian letters are in the alphabet
[{'answer': 'thirteen'}, {'provenance': [{'wikipedia_id': '26230925', 'title': 'Hawaiian alphabet', 'start_paragraph_id': 16, 'start_character': 0, 'end_paragraph_id': 16, 'end_character': 470, 'bleu_score': 0.8682295270269431, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 13693875801502480936}, 'section': 'Section::::Modern alphabet.\n'}]}]