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.

Input: Consider Input: A waiter had 33 customers to wait on . If 31 customers left and he got another 26 customers , how many customers would he have ?

Output: 28


Input: Consider Input: There are 79 pencils in a box . Eric takes 4 pencils . How many are left ?

Output: 75


Input: Consider Input: Zach scored 42 points in the football game . Ben scored 21 points . How many more points did Zach score ?


Output: 21