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:
1123 - 8657 + 3476 - 5278 + 717 - 1557 + 6614 + 1549

Ex Output:
4259


Ex Input:
5316 + 506 - 8402

Ex Output:
13212


Ex Input:
9657 + 4761 - 829 + 9271 - 4932 + 7460 + 7002

Ex Output:

-13076