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: They decided to hold the party in their backyard. They have 4 sets of tables and each set has 3 chairs. If a total of 14 people will attend the party 

 Question: How many more chairs will they have to buy?
Example Output: 2

Example Input: Context: Paul had 108 books and 55 pens. After selling some books and pens in a garage sale he had 66 books and 59 pens left. 

 Question: How many books did he sell in the garage sale?
Example Output: 42

Example Input: Context: The grasshopper and the frog had a jumping contest. The grasshopper jumped 9 inches and the frog jumped 12 inches. 

 Question: How much farther did the frog jump than the grasshopper?
Example Output:
3