You are given a math word problem and you are supposed to apply a single mathematical operator like addition, subtraction, multiplication, or division on the numbers embedded in the text to answer the following question and then only report the final numerical answer.

Example input: for a birthday party cody bought 30 regular sodas and 5 diet sodas . How many sodas are there ?
Example output: 35
Example explanation: total sods = 30+5 = 35
Q: amy had 12 pencils . if she used 4 of them how many would she have left ?
A:
8