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.

6433 + 6891 + 2386 - 7923 - 2419 + 7641
-143

6738 - 471 + 8724
-1515

2414 - 4646 - 5453 - 1705 + 5698 + 5259

3261