how many more years did d. v. graves serve compared to j. f. jenkins ?
CREATE TABLE table_203_577 (
    id number,
    "tenure" text,
    "coach" text,
    "years" number,
    "record" text,
    "pct." number
)
SELECT (SELECT "years" FROM table_203_577 WHERE "coach" = 'd. v. graves') - (SELECT "years" FROM table_203_577 WHERE "coach" = 'j. f. jenkins')
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 many more years did d. v. graves serve compared to j. f. jenkins ? ### Input: CREATE TABLE table_203_577 (
    id number,
    "tenure" text,
    "coach" text,
    "years" number,
    "record" text,
    "pct." number
) ### Response: SELECT (SELECT "years" FROM table_203_577 WHERE "coach" = 'd. v. graves') - (SELECT "years" FROM table_203_577 WHERE "coach" = 'j. f. jenkins')