Definition: 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: 1225 - 1988 - 1450 - 3833 - 4404 - 6286 - 2602
Output:
21788