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

Ex Input:
Beka flew 873 miles to visit her aunt . Jackson flew 563 miles to visit his aunt . How many more miles did Beka fly than Jackson ?

Ex Output:
310


Ex Input:
532 people are watching a movie in a theater . The theater has 750 seats . How many seats are empty in the theater ?

Ex Output:
218


Ex Input:
Kevin bought 2 watermelons . The first watermelon was 9.91 pounds , and the second watermelon was 4.11 pounds . How many pounds of watermelon did Kevin buy ?

Ex Output:

14.02