What is the average grid for competitors who had more than 22 laps and time/retired of +17.276?
CREATE TABLE table_78507 (
    "Rider" text,
    "Manufacturer" text,
    "Laps" real,
    "Time/Retired" text,
    "Grid" real
)
SELECT AVG("Grid") FROM table_78507 WHERE "Time/Retired" = '+17.276' AND "Laps" > '22'
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 average grid for competitors who had more than 22 laps and time/retired of +17.276? ### Input: CREATE TABLE table_78507 (
    "Rider" text,
    "Manufacturer" text,
    "Laps" real,
    "Time/Retired" text,
    "Grid" real
) ### Response: SELECT AVG("Grid") FROM table_78507 WHERE "Time/Retired" = '+17.276' AND "Laps" > '22'