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:
at the arcade dave spent 43 tickets on stuffed tiger . then he had 55 left . how many tickets did dave have to start with ?

Ex Output:
98

Ex Input:
gwen prepared 98 books to sell in the flea market . after the activity ended she had 96 books left . how many did she sell ?

Ex Output:
2

Ex Input:
for homework megan had 36 math problems and 28 spelling problems . if she can finish 8 problems in an hour how long will it take her to finish all the problems ?

Ex Output:
8