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: 8157 - 2717 - 1214 + 8558 + 7391 - 7163 + 6203 - 6912

SOLUTION: 4011

PROBLEM: 1860 - 6675 + 8615 + 485 + 6302 - 3385 + 1568

SOLUTION: -5050

PROBLEM: 4945 - 5041 + 1213 + 374 - 7600 + 6427 + 6545 + 9424

SOLUTION:
-6397