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.

Input: Consider Input: Context: Randy has 95 blocks. He uses 20 blocks to build a house and 50 blocks to build a tower. 

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

Output: 30


Input: Consider Input: Context: A chef had 40 apples and 54 peaches. After making some pies, he had 39 apples left. 

 Question: How many apples did he use?

Output: 1


Input: Consider Input: Context: A book has 2 chapters across 81 pages. The second chapter is 68 pages long. 

 Question: How many pages are in the second chapter?


Output: 13