Who was the Class A winner when the Class C winner was David Haynes?
CREATE TABLE "calendar_winners" (
  "round" text,
  "circuit" text,
  "date" text,
  "class_a_winner" text,
  "class_b_winner" text,
  "class_c_winner" text,
  "class_d_winner" text
);
SELECT "class_a_winner" FROM "calendar_winners" WHERE "class_c_winner"='David Haynes';