what is the total sack for mike green when fumr is less than 0?
CREATE TABLE table_name_40 (
    sack INTEGER,
    player VARCHAR,
    fumr VARCHAR
)
SELECT SUM(sack) FROM table_name_40 WHERE player = "mike green" AND fumr < 0
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 total sack for mike green when fumr is less than 0? ### Input: CREATE TABLE table_name_40 (
    sack INTEGER,
    player VARCHAR,
    fumr VARCHAR
) ### Response: SELECT SUM(sack) FROM table_name_40 WHERE player = "mike green" AND fumr < 0