Below is an context that describes a sql query, paired with an question that provides further information. Write an answer that appropriately completes the request.  # noqa: E501
### Context:
CREATE TABLE table_name_50 (class VARCHAR, erp_w VARCHAR, call_sign VARCHAR)
### Question:
What is the Class for the ERP W of more than 2 and the call sign of w223au?
### Answer:
SELECT class FROM table_name_50 WHERE erp_w > 2 AND call_sign = "w223au"