Task: Question Answering
Input (English): Passage: Trying to snap a three-game skid, the Texans flew to McAfee Coliseum for a Week 9 intraconference duel with the Oakland Raiders.  With QB Matt Schaub out with a concussion, back-up QB Sage Rosenfels got the start. In the first quarter, Houston drew first blood as RB Ahman Green got an 8-yard TD run for the only score of the period.  In the second quarter, the Texans continued to roll over the Raiders as RB Ron Dayne got a 14-yard TD run, while kicker Kris Brown nailed a 40-yard field goal.  In the third quarter, Oakland finally managed to respond as kicker Sebastian Janikowski managed to get a 22-yard field goal for the only score of the period.  In the fourth quarter, the Raiders drew closer as RB Justin Fargas got a 1-yard TD run.  Fortunately, Houston took control with Rosenfels completing a 42-yard TD pass to WR Andr&#233; Davis.  Oakland's only response was QB Josh McCown completing a 28-yard TD pass to WR Tim Dwight. With their three-game skid snapped, the Texans entered their bye week at 4-5. 
Question: How many yards was the shortest touchdown of the first two quarters? 
Answer type: Number 
Output (English): 8.