What is the frequency of the Classic Country Krki-fm booster station?
CREATE TABLE table_18758 (
    "Frequency" text,
    "Call sign" text,
    "Name" text,
    "Format" text,
    "Owner" text,
    "Target city/ market" text,
    "City of license" text
)
SELECT "Frequency" FROM table_18758 WHERE "Format" = 'Classic Country KRKI-FM booster'
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 frequency of the Classic Country Krki-fm booster station? ### Input: CREATE TABLE table_18758 (
    "Frequency" text,
    "Call sign" text,
    "Name" text,
    "Format" text,
    "Owner" text,
    "Target city/ market" text,
    "City of license" text
) ### Response: SELECT "Frequency" FROM table_18758 WHERE "Format" = 'Classic Country KRKI-FM booster'