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:
1928 - 8869 + 937 + 6209 + 5391 - 5357 + 6743

Ex Output:
-3126


Ex Input:
3083 - 4468 - 7941 + 7484 + 2789

Ex Output:
5219


Ex Input:
1035 + 7018 + 3920

Ex Output:

-9903