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: Matthew had 24 crackers. If Matthew gave equal numbers of crackers to his 3 friends and still had 17 crackers left 

 Question: How many crackers did Matthew give to his friends?

Ex Output:
7


Ex Input:
Context: There were 22 parents in the program and 676 people in total. 

 Question: How many pupils were present in the program?

Ex Output:
654


Ex Input:
Context: Randy has 86 blocks. He uses 79 blocks to build a tower and 82 blocks to build a house. 

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

Ex Output:

3