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.

Q: Context: 2 birds and 6 storks were sitting on the fence. 3 more birds came to join them. 

 Question: How many more storks than birds are sitting on the fence?

A: 1
****
Q: Context: Olivia spent 38 dollars at a supermarket. If there were 128 dollars in her wallet initially 

 Question: How much money does she have left?

A: 90
****
Q: Context: Dave had 17 apps and 21 files on his phone. After deleting some apps and files he had 3 apps and 7 files left. 

 Question: How many files did he delete?

A:
14
****