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: A book has 3 chapters. The first chapter is 53 pages long the second chapter is 75 pages long and the third chapter is 21 pages long. 

 Question: How many more pages does the first chapter have than the third chapter?
Example Output: 32

Example Input: Context: The grasshopper, the frog and the mouse had a jumping contest. The grasshopper jumped 14 inches. The mouse jumped 16 inches lesser than the frog who jumped 37 inches farther than the grasshopper. 

 Question: How much farther did the mouse jump than the grasshopper?
Example Output: 21

Example Input: Context: Paco had 28 cookies. He ate some of them and had 7 cookies left. 

 Question: How many cookies did Paco eat?
Example Output:
21