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.

Example Input: Sara has 10 marbles . She loses 7 . How many marbles will Sara have ?
Example Output: 3

Example Input: When Jake had 1 cat , he needed to serve 0.5 can of cat food each day . Now that Jake has adopted a second cat , he needs to serve a total of 0.9 can each day . How much extra food is needed to feed the second cat ?
Example Output: 0.4

Example Input: There are 33 walnut trees currently in the park . Park workers will plant 44 more walnut trees today . How many walnut trees will the park have when the workers are finished ?
Example Output:
77