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: 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?

Ex Output:
2


Ex Input:
Context: A chef had 58 apples. After making some pies, he had used 35. 

 Question: How many apples remained?

Ex Output:
23


Ex Input:
Context: 15 campers went rowing in the morning. Some more campers went rowing in the afternoon. If a total of 32 campers went rowing that day 

 Question: How many campers went rowing in the afternoon?

Ex Output:

17