Table schema:
CREATE TABLE table_name_26 (long INTEGER, gain VARCHAR, loss VARCHAR, avg_g VARCHAR)

Question: When the Gain is 29, and the average per game is 2, and the player lost less than 390 yards, what's the sum of the Long yards?
SQL: SELECT SUM(long) FROM table_name_26 WHERE loss < 390 AND avg_g = 2 AND gain > 29