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: Paul got a box of 589 crayons for his birthday. During the school year he gave 571 crayons to his friends while he lost 161 crayons. 

 Question: How many more crayons did he give to his friends than those he lost?

Ex Output:
410


Ex Input:
Context: Tiffany was collecting cans for recycling. On monday she had 7 bags of cans. The next day she found 12 more bags worth of cans. 

 Question: How many more bags did she find on the next day than she had on monday?

Ex Output:
5


Ex Input:
Context: Randy has 97 blocks. He uses some blocks to build a tower. If there are 72 blocks left 

 Question: How many blocks did he use to build the tower?

Ex Output:

25