How many laps were there in grid 21?
CREATE TABLE table_78318 (
    "Driver" text,
    "Constructor" text,
    "Laps" text,
    "Time/Retired" text,
    "Grid" text
)
SELECT "Laps" FROM table_78318 WHERE "Grid" = '21'
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: How many laps were there in grid 21? ### Input: CREATE TABLE table_78318 (
    "Driver" text,
    "Constructor" text,
    "Laps" text,
    "Time/Retired" text,
    "Grid" text
) ### Response: SELECT "Laps" FROM table_78318 WHERE "Grid" = '21'