Question: when did grover first appear on sesame street
[{'answer': 'the first season', 'provenance': [{'wikipedia_id': '232818', 'title': 'Grover', 'start_paragraph_id': 3, 'start_character': 531, 'end_paragraph_id': 3, 'end_character': 547, 'bleu_score': 1.0, 'section': 'Section::::Origins.\n'}]}, {'provenance': [{'wikipedia_id': '232818', 'title': 'Grover', 'start_paragraph_id': 3, 'start_character': 0, 'end_paragraph_id': 3, 'end_character': 798, 'bleu_score': 0.985964042079227, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 3019639005375439175}, 'section': 'Section::::Origins.\n'}]}]