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: 1123 - 8657 + 3476 - 5278 + 717 - 1557 + 6614 + 1549
Example Output: 4259

Example Input: 1231 + 6657 - 8263
Example Output: 2837

Example Input: 1464 + 6503 - 3169 - 2089
Example Output:
219