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.

Example Input: Context: Jerry had 2 action figures and 10 books on a shelf in his room. Later he added 4 more action figures to the shelf. 

 Question: How many more books than action figures were on his shelf?
Example Output: 4

Example Input: Context: Rachel had to complete 3 pages of math homework and 4 pages of reading homework. 

 Question: How many more pages of reading homework than math homework did she have?
Example Output: 1

Example Input: Context: There were 78 dollars in Olivia's wallet. She spent 15 dollars at a supermarket. 

 Question: How much money does she have left?
Example Output:
63