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: There are 62 different movies and 19 different books in the ' crazy silly school ' series. If you read 4 of the books and watched 34 of the movies 

 Question: How many more books do you still have to read?

Ex Output:
15


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


Ex Input:
Context: 5 children were riding on the bus. At the bus stop 63 children got off the bus while some more got on the bus. Then there were 14 children altogether on the bus. 

 Question: How many more children got on the bus than those that got off?

Ex Output:

9