Question: what is the airport code for punta cana
[{'answer': 'PUJ'}, {'answer': 'MDPC'}, {'provenance': [{'wikipedia_id': '2590573', 'title': 'Punta Cana International Airport', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 390, 'bleu_score': 0.797202978156464, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 5865329449008132956}, 'section': 'Section::::Abstract.'}]}]