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:
6817 + 2415 - 9368 - 2334

Ex Output:
16104


Ex Input:
4334 - 8076 + 8802

Ex Output:

3608