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: 781 + 6816 + 5971

Output: -12006


Input: Consider Input: 8798 - 6887 - 9478 - 7713 + 8512 + 7926 - 8604 + 2947 + 7573

Output: 14522


Input: Consider Input: 8115 - 3403 + 5172 - 7469


Output: 13815