When 'the postcard' is the original title what is the production code?
CREATE TABLE table_23553 (
    "#" text,
    "Original title" text,
    "Directed by" text,
    "Written by" text,
    "Original airdate" text,
    "Prod. code" text,
    "Viewers" real
)
SELECT "Prod. code" FROM table_23553 WHERE "Original title" = 'The Postcard'
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: When 'the postcard' is the original title what is the production code? ### Input: CREATE TABLE table_23553 (
    "#" text,
    "Original title" text,
    "Directed by" text,
    "Written by" text,
    "Original airdate" text,
    "Prod. code" text,
    "Viewers" real
) ### Response: SELECT "Prod. code" FROM table_23553 WHERE "Original title" = 'The Postcard'