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

Ex Input:
the host prepared 19 cakes for the party . after the party he had 9 left . how many cakes did people eat in the party ?

Ex Output:
10

Ex Input:
a restaurant sold 77 sodas in the morning and 19 in the afternoon . how many sodas did they sell total ?

Ex Output:
96

Ex Input:
a pet store took 10 birds out of a cage and had 9 still left inside . how many birds were in the cage to start with ?

Ex Output:
19