Name the young rider classification with laudelino cubino
CREATE TABLE "classification_leadership_by_stage" (
  "stage" text,
  "winner" text,
  "general_classification" text,
  "points_classification" text,
  "mountains_classification" text,
  "young_rider_classification" text,
  "trofeo_fast_team" text
);
SELECT "young_rider_classification" FROM "classification_leadership_by_stage" WHERE "winner"='Laudelino Cubino';