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: 3631 - 7822 - 8283 + 4667 - 697
Example Output: 15766

Example Input: 8399 + 608 + 4025 + 2545 - 1991 - 4609
Example Output:
7821