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:
Lisa starts with 91 bananas . Maria gives Lisa 8 more . How many bananas does Lisa end with ?

Ex Output:
99

Ex Input:
A ship full of grain crashes into a coral reef . By the time the ship is fixed , 49952 tons of grain have spilled into the water . Only 918 tons of grain remain onboard . How many tons of grain did the ship originally contain ?

Ex Output:
50870

Ex Input:
William starts with 15 tickets . He buys 3 more . How many tickets does William end with ?

Ex Output:
18