What is the grid with a yamaha manufacturer and a +19.435 time/retired?
CREATE TABLE "moto_gp_classification" (
  "rider" text,
  "manufacturer" text,
  "laps" text,
  "time_retired" text,
  "grid" text
);
SELECT "grid" FROM "moto_gp_classification" WHERE "manufacturer"='yamaha' AND "time_retired"='+19.435';