user: Question: What is the sum of FA cups of club stalybridge celtic, which has more than 0 FA trophies and a total less than 20?
Columns: ['Player', 'Club', 'League', 'FA Cup', 'FA Trophy', 'League Cup', 'Total']
Types: ['text', 'text', 'real', 'real', 'real', 'real', 'real']
Sample row: ['Geoff Horsfield', 'Halifax Town', 30.0, 4.0, 0.0, 0.0, 34.0]
SQL:

assistant: SELECT SUM("FA Cup") FROM "Table" WHERE "FA Trophy" > 0.0 AND "Club" = 'stalybridge celtic' AND "Total" < 20.0;