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:
4139 - 6541 - 2616 + 299 - 700 - 6684

Ex Output:
20381


Ex Input:
7744 - 1859 - 3667 + 1907 - 2807

Ex Output:
14170


Ex Input:
4163 - 4347 + 7910 + 1782 + 2123 + 3368 + 6689 - 7825 - 1781

Ex Output:

-3756