who was the director of the episode with production code ad1a26?
CREATE TABLE table_54650 (
    "Title" text,
    "Directed by" text,
    "Written by" text,
    "Original air date" text,
    "Production code" text
)
SELECT "Directed by" FROM table_54650 WHERE "Production code" = 'ad1a26'
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 was the director of the episode with production code ad1a26? ### Input: CREATE TABLE table_54650 (
    "Title" text,
    "Directed by" text,
    "Written by" text,
    "Original air date" text,
    "Production code" text
) ### Response: SELECT "Directed by" FROM table_54650 WHERE "Production code" = 'ad1a26'