How many Class AAAA winners where in 2002-03?
CREATE TABLE "team" (
  "school_year" text,
  "class_a" text,
  "class_aa" text,
  "class_aaa" text,
  "class_aaaa" text,
  "class_aaaaa" text
);
SELECT COUNT("class_aaaa") FROM "team" WHERE "school_year"='2002-03';