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: Winter is almost here and most animals are migrating to warmer countries. There were 89 bird families living near the mountain. If 60 bird families flew away for winter 

 Question: How many more bird families flew away for the winter than those that stayed behind?
Example Output: 31

Example Input: Context: Jesse's room is 12 feet long and 11 feet wide. 

 Question: How much longer is her room than it is wide?
Example Output: 1

Example Input: Context: Dave had 59 files and 15 apps on his phone. After deleting some apps and files he had 12 apps and 30 files left. 

 Question: How many apps did he delete?
Example Output:
3