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:
Sara has 792 black and 122 red marbles . Fred took 233 of Sara 's black marbles . How many black marbles does Sara now have ?

Ex Output:
559


Ex Input:
There are 79 pencils in a box . Eric takes 4 pencils . How many are left ?

Ex Output:
75


Ex Input:
Sara grew 43 pumpkins , but the rabbits ate 23 pumpkins . How many pumpkins does Sara have left ?

Ex Output:

20