Given a math word problem, answer the following question. You might need to apply addition or subtraction mathematical operators on the numbers embedded in the text to answer the question and then only report the final numerical answer.

Example Input: robin had 18 pieces of gum . her brother gave her some more pieces . now robin has 44 pieces in all . how many pieces of gum did robin 's brother give her ?
Example Output: 26

Example Input: bobby ate 26 pieces of candy . then he ate 17 more . how many pieces of candy did bobby eat ?
Example Output: 43

Example Input: after the aviary was the zoo 's swamp area . penny counted a total of 55 tree frogs 10 poison frogs and 13 wood frogs . how many frogs was penny able to count ?
Example Output:
78