What is the grid total associated with a Time/Retired of +33.634, and a Laps smaller than 19?
CREATE TABLE "125cc_classification" (
  "rider" text,
  "manufacturer" text,
  "laps" real,
  "time_retired" text,
  "grid" real
);
SELECT MIN("grid") FROM "125cc_classification" WHERE "time_retired"='+33.634' AND "laps"<19;