What is the ERP W for K236AM?
CREATE TABLE "kansas" (
  "call_sign" text,
  "frequency_m_hz" real,
  "city_of_license" text,
  "erp_w" real,
  "class" text,
  "fcc_info" text
);
SELECT "erp_w" FROM "kansas" WHERE "call_sign"='k236am';