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.

Example Input: 812 + 6106 - 2904 + 7738 + 7655 - 6987
Example Output: -10796

Example Input: 758 + 1664 + 5481 - 1654 - 1804 + 5232 - 9130
Example Output: 969

Example Input: 6443 - 911 + 4665 - 8565
Example Output:
11254