how long was w.b. kingsmill club president ?
CREATE TABLE table_203_639 (
    id number,
    "year" text,
    "number" text,
    "name" text
)
SELECT "year" - "year" FROM table_203_639 WHERE "name" = 'w.b. kingsmill'
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: how long was w.b. kingsmill club president ? ### Input: CREATE TABLE table_203_639 (
    id number,
    "year" text,
    "number" text,
    "name" text
) ### Response: SELECT "year" - "year" FROM table_203_639 WHERE "name" = 'w.b. kingsmill'