What's Sara Isakovi 's lane number that had a heat of 3?
CREATE TABLE table_name_43 (
    lane INTEGER,
    heat VARCHAR,
    name VARCHAR
)
SELECT SUM(lane) FROM table_name_43 WHERE heat = 3 AND name = "sara isakovič"
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's Sara Isakovi 's lane number that had a heat of 3? ### Input: CREATE TABLE table_name_43 (
    lane INTEGER,
    heat VARCHAR,
    name VARCHAR
) ### Response: SELECT SUM(lane) FROM table_name_43 WHERE heat = 3 AND name = "sara isakovič"