Name the call sign for ERP W of 27
CREATE TABLE table_77617 (
    "Call sign" text,
    "Frequency MHz" text,
    "City of license" text,
    "ERP W" real,
    "Class" text,
    "FCC info" text
)
SELECT "Call sign" FROM table_77617 WHERE "ERP W" = '27'
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: Name the call sign for ERP W of 27 ### Input: CREATE TABLE table_77617 (
    "Call sign" text,
    "Frequency MHz" text,
    "City of license" text,
    "ERP W" real,
    "Class" text,
    "FCC info" text
) ### Response: SELECT "Call sign" FROM table_77617 WHERE "ERP W" = '27'