Table: darren_sproles
Columns: name
gain
loss
long
avg_g

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 darren_sproles WHERE "loss" < 390 AND "avg_g" = 2 AND "gain" > 29