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: Frank and his friend were buying trick decks from the magic shop for 7 dollars each . How much did they spend if Frank bought 3 decks and his friend bought 2 decks ?
Example Output: 35

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: There are 48 erasers in the drawer and 30 erasers on the desk . Alyssa placed 39 erasers and 45 rulers on the desk . How many erasers are now there in total ?
Example Output:
117