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:
9118 + 5545 - 3160 + 3672 - 3568 + 5997 + 205 + 7095

Ex Output:
-6668


Ex Input:
1157 - 6558 - 5131 + 5361 - 3957 - 9161 - 5198

Ex Output:

25801