What is the lowest Grid for jj lehto with over 51 laps?
CREATE TABLE table_name_81 (
    grid INTEGER,
    laps VARCHAR,
    driver VARCHAR
)
SELECT MIN(grid) FROM table_name_81 WHERE laps > 51 AND driver = "jj lehto"
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: What is the lowest Grid for jj lehto with over 51 laps? ### Input: CREATE TABLE table_name_81 (
    grid INTEGER,
    laps VARCHAR,
    driver VARCHAR
) ### Response: SELECT MIN(grid) FROM table_name_81 WHERE laps > 51 AND driver = "jj lehto"