who was catherine s. long 's previous representative ?
CREATE TABLE table_203_400 (
    id number,
    "district" text,
    "vacator" text,
    "reason for change" text,
    "successor" text,
    "date successor\nseated" text
)
SELECT "vacator" FROM table_203_400 WHERE "successor" = 'catherine s. long'
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 catherine s. long 's previous representative ? ### Input: CREATE TABLE table_203_400 (
    id number,
    "district" text,
    "vacator" text,
    "reason for change" text,
    "successor" text,
    "date successor\nseated" text
) ### Response: SELECT "vacator" FROM table_203_400 WHERE "successor" = 'catherine s. long'