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:
781 + 6816 + 5971

Ex Output:
-12006


Ex Input:
8802 - 6452 - 1721 - 4775 + 1838 + 4933 + 9964 - 6909

Ex Output:
11924


Ex Input:
3634 - 5574 - 3604 + 8782 - 1560 - 3143 + 2152 - 7467 - 8466

Ex Output:

22514