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: At the fair there were 7 people in line for the bumper cars . If 4 of them got tired of waiting and left and 8 more got in line , how many people would be in line ?
Example Output: 11

Example Input: David removes 7 eggs from a jar . There were originally 27 eggs in the jar . How many eggs are left in the jar ?
Example Output: 20

Example Input: A teacher had 7 worksheets to grade . If she graded 2 , but then another 46 were turned in , how many worksheets would she have to grade ?
Example Output:
51