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.

Example Input: There are 5 flowers and 3 bees . How many fewer bees are there than flowers ?
Example Output: 2

Example Input: Students at Arcadia schools are participating in a coat drive . 9437 coats have been collected so far . 6922 coats were collected from the high schools , and the rest from the elementary schools . How many coats were collected at the elementary schools ?
Example Output: 2515

Example Input: A florist had 50 roses . If she sold 15 of them and then later picked 21 more , how many roses would she have ?
Example Output:
56