Task: Question Answering
Input (English): Passage: Looking for their first win, the 49ers flew to Arrowhead Stadium for an interconference duel with the Chiefs. In the 2nd quarter, the 49ers trailed early as QB Matt Cassel completed a 31-yard TD pass to WR Dexter McCluster. The 49ers replied with kicker Joe Nedney hitting a 51-yard field goal. The 49ers fell further behind when Chiefs' kicker Ryan Succop hit a 32-yard field goal and then in the third quarter when Cassel found WR Dwayne Bowe and TE Tony Moeaki on 45 and 18-yard TD passes, respectively. RB Thomas Jones followed these scores with a 3-yard TD run. The 49ers narrowed the score when QB Alex Smith made a 12-yard TD pass to WR Josh Morgan. 
Question: How many yards was the shortest touchdown of the game? 
Answer type: Number 
Output (English): 3.