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_57 (class VARCHAR, erp_w VARCHAR, call_sign VARCHAR)
### Question:
What is the class of the translator with 10 ERP W and a call sign of w273bl?
### Answer:
SELECT class FROM table_name_57 WHERE erp_w = 10 AND call_sign = "w273bl"