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: Marco and his dad went strawberry picking. Marco's strawberries weighed 30 pounds. If together their strawberries weighed 47 pounds.

Question: How much more did his strawberries weigh than his dad's?
Example Output: 13

Example Input: Context: Ed had 2 more marbles than Doug. Doug lost some of his marbles at the playground. Now Ed has 19 more marbles than doug.

Question: How many marbles did Doug lose?
Example Output: 17

Example Input: Context: Jerry had 7 action figures and 2 books on a shelf in his room. Later he added 4 more books to the shelf.

Question: How many more action figures than books were on his shelf?
Example Output:
1