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: if he spent a total of $ 700 and all the gifts cost a total of $ 561 how much money did he spend on giftwrapping and other expenses ?

Output: 139

Input: Consider Input: harry hound had a terrible earache yesterday . when i peered into his ears yesterday i found 36 frisky fleas having a party in his right ear and 85 baby fleas sleeping peacefully in his left ear . i cleaned out harry hound 's ears . how many fleas perished ?

Output: 121

Input: Consider Input: a pet store had 68 gerbils . if they sold 14 of them what 's the difference between the number of gerbils that they had before selling and they sold ?
Output: 54