Task: Question Understanding
Input (English): Passage: Another large victory gave the 49ers their first back-to-back victories of the season. Quarterback Colin Kaepernick only completed 6 of his 15 passes, with the running attack and defense at the top of their games. Frank Gore and Anthony Dixon ran for touchdowns, while cornerback Tramaine Brock picked off two Matt Schaub passes, one for a touchdown on Schaub's first pass of the game, with Tony Jerod-Eddie also picking up an interception. The 49ers improved to 3-2, just one game off the 4-1 Seattle Seahawks in the battle for NFC West, who had lost to the Indianapolis Colts.
Question: How many interceptions did the 49ers pick off?
Output (English): number