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: Jack received 6 emails in the morning, 3 emails in the afternoon and some more in the evening. If he received a total of 10 emails in the day 

 Question: How many emails did Jack receive in the afternoon?
Example Output: 1

Example Input: Context: Because of the decision Sofia asked the students to suggest specific types of food. 457 students suggested adding mashed potatoes while others suggested adding bacon to the menu. If 63 more students suggested adding mashed potatoes than those that suggested bacon 

 Question: How many students suggested bacon?
Example Output: 394

Example Input: Context: Carol was sending out birthday invitations to her friends. Each package of invitations she bought had 3 invitations in it and she bought 2 packs. If she wants to invite 9 friends 

 Question: How many extra invitations will she need to buy?
Example Output:
3