Given the task definition and input, reply with output. 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.

Passage: Coming off their bye week, the Buccaneers were still looking for their first win of the season. The Bucs traveled to the Louisiana Superdome for their third divisional match-up in a rowthis time, against the New Orleans Saints. The Bucs scored first as rookie QB Bruce Gradkowski threw an 18-yard TD pass to WR Joey Galloway in the first quarter; the Saints responded with a 21-yard field goal from kicker John Carney. The Saints continued scoring, with a 24-yard TD run from RB Deuce McAllister in the second quarter, and a 9-yard TD pass to TE Ernie Conwell in the third quarter. The Bucs finally responded with a 1-yard TD run from FB Mike Alstott, and took the lead in the fourth quarter with Gradkowski's 3-yard TD pass to TE Alex Smith. Unfortunately for the Bucs, a special teams breakdown led to Saints RB Reggie Bush getting his inaugural NFL touchdown on a 65-yard punt return, which sealed the win for the Saints.
Question: How many yards was the shortest passing touchdown?
Answer type: Number
3.