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.

Input: Consider 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?

Output: 146

Input: Consider Input: Context: A waiter had 13 customers. After some left he got 4 new customers. If he still had 9 customers

Question: How many customers left?

Output: 8

Input: Consider Input: Context: Dan has $ 2. He bought a candy bar for $ 6 and a chocolate for $ 3.

Question: How much money did he spend to buy candy bar than he did to buy chocolate?
Output: 3