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:
4264 - 4438 + 3871 + 7585 - 540 - 3455 - 6016

Ex Output:
7257


Ex Input:
8602 - 1293 - 8063 - 4529 + 453 - 6407

Ex Output:
28441


Ex Input:
4250 - 8985 - 5567 - 6857 - 639 - 3951 + 8974 - 623

Ex Output:

21898