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.

Ex Input:
haley grew 16 trees in her backyard . after a typhoon 5 died . how many trees does she have left ?

Ex Output:
11

Ex Input:
alexa and katerina stood on a scale together . the scale read 95 pounds . alexa knows she weighs 46 pounds . how much does katerina weigh ?

Ex Output:
49

Ex Input:
emily 's mom was buying extra school supplies for emily and her sister . she bought 13 packs of glue sticks total . if she gave emily 6 packs how many did her sister get ?

Ex Output:
7