How many schools with greyhounds as their nickname?
{'header': ['Institution', 'Location', 'Founded', 'Type', 'Enrollment', 'Nickname', 'Joined', 'Division'], 'page_title': 'Northeast-10 Conference', 'page_id': '', 'types': ['text', 'text', 'real', 'text', 'real', 'text', 'real', 'text'], 'id': '1-1969634-1', 'section_title': 'Current members', 'caption': 'Current members', 'rows': [['Adelphi University', 'Garden City, New York', '1896', 'Private', '8110', 'Panthers', '2009', 'Southwest'], ['American International College', 'Springfield, Massachusetts', '1885', 'Private', '3177', 'Yellow Jackets', '1980', 'Southwest'], ['Assumption College', 'Worcester, Massachusetts', '1904', 'Catholic', '2753', 'Greyhounds', '1980', 'Northeast'], ['Bentley University', 'Waltham, Massachusetts', '1917', 'Private', '5497', 'Falcons', '1980', 'Northeast'], ['The College of Saint Rose', 'Albany, New York', '1920', 'Catholic', '3116', 'Golden Knights', '2000', 'Southwest'], ['Franklin Pierce University', 'Rindge, New Hampshire', '1962', 'Private', '2871', 'Ravens', '2000', 'Northeast'], ['Le Moyne College', 'Syracuse, New York', '1946', 'Catholic', '2797', 'Dolphins', '1996', 'Southwest'], ['Merrimack College', 'North Andover, Massachusetts', '1947', 'Catholic', '2490', 'Warriors', '1984', 'Northeast'], ['Pace University', 'Pleasantville, New York', '1906', 'Private', '8928', 'Setters', '1997', 'Southwest'], ['Saint Anselm College', 'Goffstown, New Hampshire', '1889', 'Catholic', '1945', 'Hawks', '1981', 'Northeast'], ["Saint Michael's College", 'Colchester, Vermont', '1904', 'Catholic', '2437', 'Purple Knights', '1987', 'Northeast'], ['Southern Connecticut State University', 'New Haven, Connecticut', '1893', 'Public', '12326', 'Fighting Owls', '2000', 'Southwest'], ['Southern New Hampshire University', 'Manchester, New Hampshire', '1932', 'Private', '4490', 'Penmen', '2000', 'Northeast'], ['Stonehill College', 'Easton, Massachusetts', '1948', 'Catholic', '2386', 'Skyhawks', '1980', 'Northeast']], 'name': 'table_1969634_1'}