What type of formula did Stirling Moss drive?
CREATE TABLE "winners_of_the_danish_grand_prix" (
  "year" real,
  "driver" text,
  "constructor" text,
  "location" text,
  "formula" text,
  "report" text
);
SELECT "formula" FROM "winners_of_the_danish_grand_prix" WHERE "driver"='Stirling Moss';