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: 4397 - 3478 - 9837 - 7164 + 7972 + 3676

Output: 13228


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

Output: -5841


Input: Consider Input: 4977 - 6056 + 6700 + 6783 - 7142 + 3900


Output: 792