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: Nell collects baseball cards. She had 528 cards while Jeff had 11 cards. She gave some of her cards to jeff and now has 252 cards left. 

 Question: How many cards did Nell give to Jeff?
Example Output: 276

Example Input: Context: Randy has 37 blocks. He uses 33 blocks to build a tower and 13 blocks to build a house. 

 Question: How many more blocks did he use to build the tower than he did to build the house?
Example Output: 20

Example Input: Context: A waiter had 3 customers. After some more arrived he had 8 customers. 

 Question: How many new customers arrived?
Example Output:
5