Given a math word problem, answer the following question. You might need to apply addition or subtraction mathematical operators on the numbers embedded in the text to answer the question and then only report the final numerical answer.

Input: Consider Input: haley bought 11 new shirts for school . if she returned 6 of them how many did she end up with ?

Output: 5

Input: Consider Input: there were 8 ducks swimming in the pond . 3 ducks flew away . how many ducks are still swimming in the pond ?

Output: 5

Input: Consider Input: 532 people are watching a movie in a theater . the theater has 750 seats . how many seats are empty in the theater ?
Output: 218