What is the highest Sack with an Assisted larger than 4, with TD's smaller than 0?
CREATE TABLE table_56450 (
    "Player" text,
    "Tackles" real,
    "Solo" real,
    "Assisted" real,
    "Sack" real,
    "Yards" real,
    "TD's" real
)
SELECT MAX("Sack") FROM table_56450 WHERE "Assisted" > '4' AND "TD's" < '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 highest Sack with an Assisted larger than 4, with TD's smaller than 0? ### Input: CREATE TABLE table_56450 (
    "Player" text,
    "Tackles" real,
    "Solo" real,
    "Assisted" real,
    "Sack" real,
    "Yards" real,
    "TD's" real
) ### Response: SELECT MAX("Sack") FROM table_56450 WHERE "Assisted" > '4' AND "TD's" < '0'