user: Question: How many entries are there for class when the prior experience is Shasta H.S.
Columns: ['Player', 'Position', 'Games started', 'Hometown', 'Height', 'Weight', 'Class', 'Prior experience']
Types: ['text', 'text', 'text', 'text', 'text', 'real', 'text', 'text']
Sample row: ['Herbert S. Graver', 'Left end', '1', 'Chicago, Illinois', '5\' 9"', 157.0, "Eng '04", 'Englewood H.S.']
SQL:

assistant: SELECT COUNT("Class") FROM "Table" WHERE "Prior experience" = 'Shasta H.S.';