What is the total number of the ERP W with a call sign of w242ak?
CREATE TABLE table_name_81 (
    erp_w VARCHAR,
    call_sign VARCHAR
)
SELECT COUNT(erp_w) FROM table_name_81 WHERE call_sign = "w242ak"
Below are sql tables schemas paired with instruction that describes a task. Using valid SQLite, write a response that appropriately completes the request for the provided tables. ### Instruction: What is the total number of the ERP W with a call sign of w242ak? ### Input: CREATE TABLE table_name_81 (
    erp_w VARCHAR,
    call_sign VARCHAR
) ### Response: SELECT COUNT(erp_w) FROM table_name_81 WHERE call_sign = "w242ak"