user: Question: Can you tell me the sum of Grid that has the Time of +6.355, and the Laps larger than 23?
Columns: ['Rider', 'Manufacturer', 'Laps', 'Time', 'Grid']
Types: ['text', 'text', 'real', 'text', 'real']
Sample row: ['Simone Corsi', 'Aprilia', 23.0, '40:56.168', 1.0]
SQL:

assistant: SELECT SUM("Grid") FROM "Table" WHERE "Time" = '+6.355' AND "Laps" > 23.0;