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: Zachary did 44 push-ups and 17 crunches in gym class today. David did 29 more push-ups but 13 less crunches than zachary.

Question: How many crunches did David do?

Ex Output:
4

Ex Input:
Context: Julia played tag with 5 kids on monday. She played tag with some more kids on tuesday. If she played with a total of 15 kids

Question: How many kids did she play with on tuesday?

Ex Output:
10

Ex Input:
Context: Dave had 24 files and 13 apps on his phone. After deleting some apps and files he had 17 apps and 21 files left.

Question: How many files did he delete?

Ex Output:
3