You are given a math word problem and you are supposed to apply addition or subtraction mathematical operators on the numbers embedded in the text to answer the following question and then only report the final numerical answer.

Example Input: Bianca had 45 coloring books . If she gave away 6 of them , but then bought 20 more , how many would she have total ?
Example Output: 59

Example Input: Paul made 68 dollars mowing lawns and 13 dollars weed eating . If he only spent 9 dollar a week , how long would the money last him ?
Example Output: 9

Example Input: Joan decided to sell all of her old books . She gathered up 33 books to sell . She sold 26 books in a yard sale . How many books does Joan now have ?
Example Output:
7