CREATE TABLE table_69061 ("Call sign" TEXT, "Frequency MHz" FLOAT, "City of license" TEXT, "ERP W" TEXT, "Class" TEXT, "FCC info" TEXT)

Which ERP W has a Class of A, and a Call sign of wffc?
SELECT "ERP W" FROM table_69061 WHERE "Class" = 'a' AND "Call sign" = 'wffc'
SELECT "ERP W" FROM "table_69061" WHERE "Call sign" = 'wffc' AND "Class" = 'a'