What is the class when the frequency is 560 AM?
CREATE TABLE "s_rebroadcaster_of_cfwh_fm" (
  "city_of_license" text,
  "identifier" text,
  "frequency" text,
  "power" text,
  "class" text,
  "rec_net" text
);
SELECT "class" FROM "s_rebroadcaster_of_cfwh_fm" WHERE "frequency"='560 am';