What is the rank of the cinema when the headquarters are in toronto, ON and the screens is less than 1,438?
CREATE TABLE "north_america" (
  "rank" real,
  "circuit" text,
  "headquarters" text,
  "screens" real,
  "sites" real
);
SELECT AVG("rank") FROM "north_america" WHERE "headquarters"='toronto, on' AND "screens"<'1,438';