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:
1510 + 8779 + 5742 - 9951 - 2155

Ex Output:
-905


Ex Input:
9776 + 5760 + 5961 - 1401 - 1368

Ex Output:
824


Ex Input:
331 + 1932 + 9222 + 1966

Ex Output:

-12789