user: Question: What is the total enrollment of the aa IHSaa class?
Columns: ['School', 'Location', 'Mascot', 'Enrollment', 'IHSAA Class', 'IHSAA Football Class', '# / County']
Types: ['text', 'text', 'text', 'real', 'text', 'text', 'text']
Sample row: ['Caston', 'Fulton', 'Comets', 240.0, 'A', 'A', '25 Fulton']
SQL:

assistant: SELECT SUM("Enrollment") FROM "Table" WHERE "IHSAA Class" = 'aa';