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: A pet store had 36 siamese cats and 18 house cats . During a sale they sold 26 cats . How many cats do they have left ?
Example Output: 28

Example Input: Kelly has 121 Nintendo games . How many does Kelly need to give away so that Kelly will have 22 games left ?
Example Output: 99

Example Input: Paul bought 6 boxes of chocolate candy and 4 boxes of caramel candy . If each box has 9 pieces inside it , how much candy did he have total ?
Example Output:
90