What is the sum of the laps with a grid less than 28, retirement time, and a ducati 1098 f08 bikes?
CREATE TABLE table_9819 (
    "Rider" text,
    "Bike" text,
    "Laps" real,
    "Time" text,
    "Grid" real
)
SELECT SUM("Laps") FROM table_9819 WHERE "Grid" < '28' AND "Time" = 'retirement' AND "Bike" = 'ducati 1098 f08'
Below are sql tables schemas paired with instruction that describes a task. Using valid SQLite, write a response that appropriately completes the request for the provided tables. ### Instruction: What is the sum of the laps with a grid less than 28, retirement time, and a ducati 1098 f08 bikes? ### Input: CREATE TABLE table_9819 (
    "Rider" text,
    "Bike" text,
    "Laps" real,
    "Time" text,
    "Grid" real
) ### Response: SELECT SUM("Laps") FROM table_9819 WHERE "Grid" < '28' AND "Time" = 'retirement' AND "Bike" = 'ducati 1098 f08'