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.

Ex Input:
next on his list is the famous empire state building . there he learned that the building stands 1250 feet to the top floor and the antenna spire is 204 feet . how tall is the empire state building ?

Ex Output:
1454

Ex Input:
a store has 49 shirts . after selling some there were 28 left . how many did they sell ?

Ex Output:
21

Ex Input:
mrs. hilt had 15 cents . she bought a pencil for 11 cents . how much money did she have left ?

Ex Output:
4