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: 6108 + 6734 + 3016 + 637 - 2671 - 5486 - 1133 + 1713 - 2180

SOLUTION: 5478

PROBLEM: 638 + 4363 - 3987 + 9267

SOLUTION:
-9005