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: 1231 + 6657 - 8263
Example Output: 2837

Example Input: 5539 + 616 - 1640 - 7665 - 8787 - 5104 + 8431 + 9502
Example Output: 10186

Example Input: 8449 - 3319 + 2433 - 3560
Example Output:
12895