Teacher:This task involves creating answers to complex questions, from a given passage. Answering these questions, typically involve understanding multiple sentences. Make sure that your answer has the same type as the "answer type" mentioned in input. The provided "answer type" can be of any of the following types: "span", "date", "number". A "span" answer is a continuous phrase taken directly from the passage or question. You can directly copy-paste the text from the passage or the question for span type answers. If you find multiple spans, please add them all as a comma separated list. Please restrict each span to five words. A "number" type answer can include a digit specifying an actual value. For "date" type answers, use DD MM YYYY format e.g. 11 Jan 1992. If full date is not available in the passage you can write partial date such as 1992 or Jan 1992. If you find multiple spans, please add them all as a comma separated list. Please restrict each span to five words.
Teacher: Now, understand the problem? Solve this instance: 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
Student:
3.