What is the date in which a politician who left office on 1840-10-11 for a politician whose election number was 11?
CREATE TABLE "elections_to_congress_of_deputies" (
  "election_number" real,
  "election_date" text,
  "district" text,
  "province" text,
  "took_office" text,
  "left_office" text
);
SELECT "left_office" FROM "elections_to_congress_of_deputies" WHERE "election_number"=11;