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: 43 children were riding on the bus. At the bus stop some children got off the bus. Then there were 21 children left on the bus. 

 Question: How many children got off the bus at the bus stop?

Ex Output:
22


Ex Input:
Context: A grocery store had a total of 30 bottles of which 28 were bottles of regular soda and the rest were bottles of diet soda. 

 Question: How many bottles of diet soda did they have?

Ex Output:
2


Ex Input:
Context: 2 red peaches, 6 yellow peaches and 14 green peaches are in the basket. 

 Question: How many more green peaches than yellow peaches are in the basket?

Ex Output:

8


