What is the Took Office Date of the Presidency that Left Office Incumbent?
CREATE TABLE table_name_42 (
    took_office INTEGER,
    left_office VARCHAR
)
SELECT SUM(took_office) FROM table_name_42 WHERE left_office = "incumbent"
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 Took Office Date of the Presidency that Left Office Incumbent? ### Input: CREATE TABLE table_name_42 (
    took_office INTEGER,
    left_office VARCHAR
) ### Response: SELECT SUM(took_office) FROM table_name_42 WHERE left_office = "incumbent"