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: simon mark kevin and carl love collecting stamps . they meet up every month to compare and share their collections with each other . during the previous month kevin was able to collect 45 stamps while simon was only able to collect 27 how many more stamps does kevin have more than simon ?

Output: 18

Input: Consider Input: annette and caitlin weigh 95 pounds together . caitlin and sara weigh 87 pounds together . how much more does annette weigh than sara ?

Output: 8

Input: Consider Input: lucy put 68 shells in her bucket . she found some more shells and now she has 89 shells . how many more did she find ?
Output: 21