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

Ex Input:
Context: Paul had 42 pens and 143 books. After selling some books and pens in a garage sale he had 113 books and 19 pens left. 

 Question: How many pens did he sell in the garage sale?

Ex Output:
23


Ex Input:
Context: In a school there are 569 girls and 236 boys. 

 Question: How many more girls than boys does the school have?

Ex Output:
333


Ex Input:
Context: Lewis earns $ 21 every week during the 216 weeks of harvest. If he has to pay $ 702 tax 

 Question: How much money will have at the end of the harvest season?

Ex Output:

3834