How many entries are there for class when the prior experience is shasta h.s.
{'header': ['Player', 'Position', 'Games started', 'Hometown', 'Height', 'Weight', 'Class', 'Prior experience'], 'page_title': '1901 Michigan Wolverines football team', 'section_title': 'Varsity letter winners', 'caption': 'Varsity letter winners', 'rows': [['Herbert S. Graver', 'Left end', '1', 'Chicago, Illinois', '5\' 9"', '157', "Eng '04", 'Englewood H.S.'], ['George W. Gregory', 'Center', '11', 'Redding, California', '6\' 1/2"', '188', "Law '04", 'Shasta H.S.'], ['Albert E. Herrnstein', 'Right end Right halfback', '7 2', 'Chillicothe, Ohio', '5\' 11"', '168', "Lit. '03", 'Sub'], ['Willie Heston', 'Left halfback Right halfback', '6 1', 'Grants Pass, Oregon', '5\' 10"', '175', "Law '04", 'San Jose Normal'], ['Dan McGugin', 'Left guard', '10', 'Tingley, Iowa', '5\' 11"', '175', "Law '04", 'Drake University'], ['Curtis Redden', 'Left end', '10', 'Rossville, Illinois', '6\' 3/4"', '166', "Law '03", 'Varsity (1 yr)'], ['Arthur Redner', 'Halfback', '0', 'Bessemer, Michigan', '5\' 9"', '156', "Eng. '04", 'Varsity (1 yr)'], ['Bruce Shorts', 'Right tackle', '11', 'Mt. Pleasant, Michigan', '6\' 1"', '190', "Law '01 (P.G.)", 'Varsity (1 yr)'], ['Neil Snow', 'Fullback', '11', 'Detroit, Michigan', '6\' 2"', '185', "Lit. '02", 'Varsity (3 yrs)'], ['Everett Sweeley', 'Right halfback Left halfback Right end', '7 3 1', 'Sioux City, Iowa', '6\' 1/4"', '167', "Lit. '03", 'Varsity (2 yrs)'], ['Boss Weeks', 'Quarterback', '11', 'Allegan, Michigan', '5\' 7"', '150', "Law '02", 'Varsity (1 yr)'], ['Hugh White', 'Left tackle', '11', 'Lapeer, Michigan', '5\' 11"', '180', "Law '02", 'Varsity (3 yrs)']]}