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:
2177 - 4714 + 9417 - 376 - 2611 + 7130 - 2152

Ex Output:
-4517


Ex Input:
8229 + 5738 + 1168 - 7960

Ex Output:

9283