Question: how many videos is maddie in with sia
[{'answer': 'six', 'provenance': [{'wikipedia_id': '41938992', 'title': 'Maddie Ziegler', 'start_paragraph_id': 8, 'start_character': 578, 'end_paragraph_id': 8, 'end_character': 581, 'bleu_score': 1.0, 'section': 'Section::::Career.:"Dance Moms" and music videos.\n'}]}, {'provenance': [{'wikipedia_id': '41938992', 'title': 'Maddie Ziegler', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 699, 'bleu_score': 0.8441878271473551, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 6381779728918605476}, 'section': 'Section::::Abstract.'}]}]