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:
Charles has 25 Skittles . Diana takes 7 away . How many Skittles will Charles have ?

Ex Output:
18

Ex Input:
Cade had 87 marbles . He gave 8 to Dylan . How many does he have left ?

Ex Output:
79

Ex Input:
Scott has 4 tickets . Ernest has with 9 tickets . Ernest finds another 72 . How many tickets does Ernest end with ?

Ex Output:
81