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:
2671 + 3943 - 5777 + 7680

Ex Output:
-3175

Ex Input:
1860 - 6675 + 8615 + 485 + 6302 - 3385 + 1568

Ex Output:
-5050

Ex Input:
9237 + 5388 - 46 + 2616 + 8227 - 3578 - 5065 + 1176

Ex Output:
519