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:
3186 + 271 - 7916

Ex Output:
10831


Ex Input:
1971 - 5591 + 4038 + 5571

Ex Output:
-2047


Ex Input:
4881 - 8176 - 2814 - 6990 + 7911 - 7950 + 9561 - 2599

Ex Output:

15938