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: 9493 + 2402 - 721 + 5448 + 2919
Example Output: -555

Example Input: 8135 + 8670 + 4936
Example Output:
-5471