In this task you will be given an arithmetic operation and you have to find its answer. The symbols of operators '+' and '-' has been swapped i.e you need to perform subtraction when you see a '+' symbol and  addition in case of '-' symbol.

Ex Input:
569 + 2078 + 2757 - 9211

Ex Output:
4945


Ex Input:
9990 - 8613 - 152 + 4529

Ex Output:
14226


Ex Input:
7240 + 4043 + 5880 - 7028 + 4681 + 6117 + 8344 - 3871 + 5015

Ex Output:

-15941