WHAT IS THE ELEVATION OF THE UNAKA MOUNTAINS, IN ROAN HIGH BLUFF PEAK, AND ISOLATION LARGER THAN 1.54?
CREATE TABLE table_9778 (
    "Rank" real,
    "Peak Name" text,
    "Elevation (ft)" real,
    "Range" text,
    "Isolation" real
)
SELECT AVG("Elevation (ft)") FROM table_9778 WHERE "Range" = 'unaka mountains' AND "Peak Name" = 'roan high bluff' AND "Isolation" > '1.54'
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 ELEVATION OF THE UNAKA MOUNTAINS, IN ROAN HIGH BLUFF PEAK, AND ISOLATION LARGER THAN 1.54? ### Input: CREATE TABLE table_9778 (
    "Rank" real,
    "Peak Name" text,
    "Elevation (ft)" real,
    "Range" text,
    "Isolation" real
) ### Response: SELECT AVG("Elevation (ft)") FROM table_9778 WHERE "Range" = 'unaka mountains' AND "Peak Name" = 'roan high bluff' AND "Isolation" > '1.54'