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: 4515 - 2156 - 8427 - 2175
Example Output: 17273

Example Input: 8213 + 7145 + 5203 - 2621 + 1654 - 1844
Example Output: -1324

Example Input: 8679 + 3559 + 2407 + 4567 - 9021 + 2831
Example Output:
4336