what is the class of the station with erp w more than 30?
CREATE TABLE table_71454 (
    "Call sign" text,
    "Frequency MHz" real,
    "City of license" text,
    "ERP W" real,
    "Class" text,
    "FCC info" text
)
SELECT "Class" FROM table_71454 WHERE "ERP W" > '30'
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 class of the station with erp w more than 30? ### Input: CREATE TABLE table_71454 (
    "Call sign" text,
    "Frequency MHz" real,
    "City of license" text,
    "ERP W" real,
    "Class" text,
    "FCC info" text
) ### Response: SELECT "Class" FROM table_71454 WHERE "ERP W" > '30'