What is the earliest year of Valdimir Poelnikov, who has a final position-tour bigger than 72, a final position-vuelta less than 77, and a final position-giro less than 57?
CREATE TABLE "grand_tour_finishers" (
  "rider" text,
  "year" real,
  "final_position_giro" real,
  "final_position_tour" real,
  "final_position_vuelta" real
);
SELECT MIN("year") FROM "grand_tour_finishers" WHERE "final_position_tour">72 AND "final_position_vuelta"<77 AND "final_position_giro"<57 AND "rider"='valdimir poelnikov';