Task: Question Answering
Input (English): Passage: In week 13, the Lions traveled south for a nationally televised prime-time contest with the New Orleans Saints. The Saints scored the only points of the first quarter when John Kasay kicked a 39-yard field goal. New Orleans added to their lead in the second quarter with 2 consecutive touchdowns: first with a 14-yard run by Mark Ingram Jr., then a 67-yard catch and run by Robert Meachem. Detroit scored their only points of the first half when Kevin Smith ran in a touchdown from 2 yards out. The Saints responded when Drew Brees threw a 20-yard touchdown pass to Lance Moore. After halftime, the Lions attempted a comeback when Jason Hanson kicked a 31-yard field goal, and later Maurice Morris caught a 9-yard touchdown pass from Matthew Stafford. However, the Saints pulled away in the final quarter when Darren Sproles caught a 6-yard pass for a touchdown. 
Question: How many yards difference is there between John Kasay's field goal and Jason Hanson's field goal? 
Answer type: Number 
Output (English): 8.