Question: what is the total number of letters in greek alphabet
[{'answer': '24 letters', 'provenance': [{'wikipedia_id': '715909', 'title': 'Greek alphabet', 'start_paragraph_id': 88, 'start_character': 333, 'end_paragraph_id': 88, 'end_character': 343, 'bleu_score': 1.0, 'section': 'Section::::Other uses.:Use as numerals.\n'}]}, {'provenance': [{'wikipedia_id': '715909', 'title': 'Greek alphabet', 'start_paragraph_id': 2, 'start_character': 70, 'end_paragraph_id': 2, 'end_character': 378, 'bleu_score': 0.6596374113094581, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 16597291029832062990}, 'section': 'Section::::Abstract.'}]}]