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:
2181 + 397 + 8824 - 2945 + 612 + 9971 + 1036 - 7693

Ex Output:
-8021


Ex Input:
7581 + 8916 + 7584 + 7731

Ex Output:
-16650


Ex Input:
4633 + 273 + 2791

Ex Output:

1569