When gray wolves is the team nickname how many institutions are there?
CREATE TABLE table_28211213_2 (
    institution VARCHAR,
    team_nickname VARCHAR
)
SELECT COUNT(institution) FROM table_28211213_2 WHERE team_nickname = "Gray Wolves"
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: When gray wolves is the team nickname how many institutions are there? ### Input: CREATE TABLE table_28211213_2 (
    institution VARCHAR,
    team_nickname VARCHAR
) ### Response: SELECT COUNT(institution) FROM table_28211213_2 WHERE team_nickname = "Gray Wolves"