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: The school is planning a field trip. The school has 102 classrooms. There are 11 students in the school and 99 seats on each school bus. If 8 students do n't want to go for the trip 

 Question: How many students are going on the trip?

Ex Output:
3


Ex Input:
Context: Julia played tag with 5 kids on monday. She played tag with some more kids on tuesday. If she played with a total of 15 kids 

 Question: How many kids did she play with on tuesday?

Ex Output:
10


Ex Input:
Context: There are 8 different movies and 21 different books in the ' crazy silly school ' series. If you read 7 of the books and watched 4 of the movies 

 Question: How many more movies do you still have to watch?

Ex Output:

4