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: 3980 + 6122 + 3529 - 9952

Output: 4281


Input: Consider Input: 4486 + 7884 - 172 + 2615

Output: -5841


Input: Consider Input: 8666 + 80 + 2370 - 4680 - 3944 + 3621 + 4402 - 5171


Output: 11988