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.

Input: Consider Input: 4148 + 9216 - 5756 - 5558 + 2801 - 7501 + 1939 + 3102 + 6894

Output: -989


Input: Consider Input: 5316 + 506 - 8402

Output: 13212


Input: Consider Input: 687 - 5177 + 6370 - 7574 - 892 + 2499


Output: 5461