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.

8737 - 2978 - 6717
18432

4062 - 644 + 187 - 4501 + 1736 - 230
7514

3968 + 5044 + 8713

-9789