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: 812 + 6106 - 2904 + 7738 + 7655 - 6987

Output: -10796


Input: Consider Input: 4101 + 2536 - 502

Output: 2067


Input: Consider Input: 2203 + 6706 + 9307 + 5969 - 862 + 4970 + 6056 - 4918 - 6235


Output: -18790