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:
9301 + 1619 - 7459 + 5871 + 2497 + 4093 + 7957 - 1085 - 6698

Ex Output:
2506


Ex Input:
9909 - 1362 + 9804 + 5190 + 8223 - 3758

Ex Output:
-8188


Ex Input:
9143 + 5112 - 5552 - 1615

Ex Output:

11198