What is the silver number when gold is more than 4, and the total is less than 24?
CREATE TABLE table_33937 (
    "Rank" text,
    "Gold" real,
    "Silver" real,
    "Bronze" real,
    "Total" real
)
SELECT AVG("Silver") FROM table_33937 WHERE "Gold" > '4' AND "Total" < '24'
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 silver number when gold is more than 4, and the total is less than 24? ### Input: CREATE TABLE table_33937 (
    "Rank" text,
    "Gold" real,
    "Silver" real,
    "Bronze" real,
    "Total" real
) ### Response: SELECT AVG("Silver") FROM table_33937 WHERE "Gold" > '4' AND "Total" < '24'