instruction:
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.
question:
3123 + 9519 - 2864 + 9440 - 756 + 252
answer:
-12468


question:
1540 + 6977 + 9400 - 5524 - 1970 + 8397 - 6006 + 3183
answer:
-12917


question:
1891 - 2528 + 7244 - 8511 - 2188 + 9621
answer:

-1747