TASK 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.
PROBLEM: 1231 + 6657 - 8263

SOLUTION: 2837

PROBLEM: 6815 - 396 - 2187 + 8526 + 1176 - 7273 - 9622

SOLUTION: 16591

PROBLEM: 7839 + 5154 + 135

SOLUTION:
2550