What episode had sumo ball for event 3 and the wall for event 4?
CREATE TABLE table_8559 (
    "Episode Number" real,
    "Air Date" text,
    "Event 1" text,
    "Event 2" text,
    "Event 3" text,
    "Event 4" text
)
SELECT AVG("Episode Number") FROM table_8559 WHERE "Event 4" = 'the wall' AND "Event 3" = 'sumo ball'
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 episode had sumo ball for event 3 and the wall for event 4? ### Input: CREATE TABLE table_8559 (
    "Episode Number" real,
    "Air Date" text,
    "Event 1" text,
    "Event 2" text,
    "Event 3" text,
    "Event 4" text
) ### Response: SELECT AVG("Episode Number") FROM table_8559 WHERE "Event 4" = 'the wall' AND "Event 3" = 'sumo ball'