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:
Anne weighs 67 pounds . Douglas weighs 52 pounds . How much heavier is Anne than Douglas ?

Ex Output:
15


Ex Input:
Joan picked 43 apples from the orchard , and gave 27 apples to Melanie . How many apples does Joan have now ?

Ex Output:
16


Ex Input:
It took me 6 minutes to walk 500 meters . How fast was I travelling ?

Ex Output:

83.33