Task: Question Answering
Input (English): Passage: Still looking for their first win, the Cowboys flew to Reliant Stadium for a Texas rivalry match against the Houston Texans. Dallas trailed early in the second quarter when kicker Neil Rackers hit a 24-yard field goal. Then they took the lead with RB Marion Barber getting a 1-yard TD run, followed by kicker David Buehler's 49-yard field goal. The Cowboys increased their lead in the third quarter when QB Tony Romo completed a 15-yard TD pass to WR Roy E. Williams. Houston replied with Rackers nailing a 30-yard field goal, but Dallas continued to score when Romo found Williams again on a 63-yard TD pass. Then David Buehler made a 40-yard field goal. The Texans would finally score when QB Matt Schaub made a 7-yard TD pass to WR Kevin Walter; the Texans' onside kick attempt was good, but an interception made by Dallas safety Danny McCray ended any chances of a Texans comeback With the win, Dallas went into its bye week at 1-2. 
Question: How many yards was the shortest touchdown pass? 
Answer type: Number 
Output (English): 7.