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: Next on his checklist is wax to stick the feathers together. If the feathers require 166 g of wax and right now he has 20 g 

 Question: How many more grams of wax does he need?

Ex Output:
146


Ex Input:
Context: 52 campers went rowing in the morning. 61 campers went rowing in the afternoon. 

 Question: How many more campers went rowing in the afternoon than in the morning?

Ex Output:
9


Ex Input:
Context: After eating a hearty meal they went to see the Buckingham palace. There, Rachel learned that 705 visitors came to the Buckingham palace that day. If there were 191 visitors the previous day and 457 visitors the day before that 

 Question: How many more visitors visited the Buckingham palace on that day than on the previous 245 days?

Ex Output:

57