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.

Input: Consider Input: robin 's hair was 15 inches long . if she cut off 5 inches how long is her hair now ?

Output: 10


Input: Consider Input: at the arcade billy had won 48 tickets . after buying a yoyo he had 32 tickets left . how many tickets did the yoyo cost ?

Output: 16


Input: Consider Input: cheryl and lori started a lemonade stand on friday . they bought 85 plastic cups . they sold a lot of lemonade and only had 18 cups left . how many cups did cheryl and lori use ?

Show your work and conclude with the exact phrasing "Therefore, the final answer is [answer]." where [answer] is just the final number or expression that solves the problem.
user
Output: 67


