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:
Tom has 9 yellow balloons . Sara has 8 yellow balloons . How many yellow balloons do they have in total ?

Ex Output:
17


Ex Input:
Sara had 21 quarters in her bank . Her dad gave her 49 more quarters . How many quarters does she have now ?

Ex Output:
70


Ex Input:
Willy has 1400 crayons . Lucy has 290 crayons . How many more crayons does Willy have then Lucy ?

Ex Output:

1110