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:
1231 + 6657 - 8263

Ex Output:
2837


Ex Input:
812 + 6106 - 2904 + 7738 + 7655 - 6987

Ex Output:
-10796


Ex Input:
4787 - 387 + 7146 + 8983 + 752

Ex Output:

-11707