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: 2671 + 3943 - 5777 + 7680
Example Output: -3175

Example Input: 8137 + 5006 - 7743 + 1478
Example Output: 9396

Example Input: 6841 + 9349 - 3429 - 2404 + 2869 + 6921
Example Output:
-6465