Instructions: 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.
Input: 2705 - 9364 - 6850 - 4579 - 4494 - 4688 - 1455 - 8685
Output:
42820