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

Ex Input:
A pet store had 12 siamese cats and 20 house cats . During a sale they sold 20 cats . How many cats do they have left ?

Ex Output:
12

Ex Input:
Ralph starts with 74 peanuts . He loses 59 . How many peanuts does Ralph end with ?

Ex Output:
15

Ex Input:
Dan grew 42 turnips and 38 cantelopes . Jessica grew 47 turnips . How many turnips did they grow in total ?

Ex Output:
89