What is the sum of the season with 8 clubs and shanghai as the runners-up?
CREATE TABLE table_name_63 (
    season INTEGER,
    number_of_clubs VARCHAR,
    runners_up VARCHAR
)
SELECT SUM(season) FROM table_name_63 WHERE number_of_clubs = 8 AND runners_up = "shanghai"
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 season with 8 clubs and shanghai as the runners-up? ### Input: CREATE TABLE table_name_63 (
    season INTEGER,
    number_of_clubs VARCHAR,
    runners_up VARCHAR
) ### Response: SELECT SUM(season) FROM table_name_63 WHERE number_of_clubs = 8 AND runners_up = "shanghai"