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: Tiffany was collecting cans for recycling. On monday she had 4 bags of cans. The next day she found some more bags worth of cans. If she had a total of 6 bags altogether 

 Question: How many bags did she find on the next day?
Example Output: 2

Example Input: Context: Robin cut off 13 inches of his hair. If his hair was 14 inches long initially 

 Question: How long is his hair now?
Example Output: 1

Example Input: Context: Marco and his dad went strawberry picking. Together their strawberries weighed 4 pounds. Marco's strawberries weighed 19 pounds. 

 Question: How much more did his strawberries weigh than his dad's?
Example Output:
34