Who wrote the episode that David Tucker directed?
CREATE TABLE table_19805 (
    "#" real,
    "Episode" text,
    "Writer" text,
    "Director" text,
    "Original air date" text,
    "Viewing figure" text
)
SELECT COUNT("Writer") FROM table_19805 WHERE "Director" = 'David Tucker'
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: Who wrote the episode that David Tucker directed? ### Input: CREATE TABLE table_19805 (
    "#" real,
    "Episode" text,
    "Writer" text,
    "Director" text,
    "Original air date" text,
    "Viewing figure" text
) ### Response: SELECT COUNT("Writer") FROM table_19805 WHERE "Director" = 'David Tucker'