What match number has a ground of H and the opponent Chelsea under 18s?
CREATE TABLE table_name_37 (
    match INTEGER,
    ground VARCHAR,
    opponent VARCHAR
)
SELECT AVG(match) FROM table_name_37 WHERE ground = "h" AND opponent = "chelsea under 18s"
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 match number has a ground of H and the opponent Chelsea under 18s? ### Input: CREATE TABLE table_name_37 (
    match INTEGER,
    ground VARCHAR,
    opponent VARCHAR
) ### Response: SELECT AVG(match) FROM table_name_37 WHERE ground = "h" AND opponent = "chelsea under 18s"