CREATE TABLE table_name_50 (class VARCHAR2, erp_w VARCHAR2, call_sign VARCHAR2)

What is the Class for the ERP W of more than 2 and the call sign of w223au?
SELECT class FROM table_name_50 WHERE erp_w > 2 AND call_sign = "w223au"
SELECT "class" FROM "table_name_50" WHERE "call_sign" = "w223au" AND "erp_w" > 2