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:
1510 + 8779 + 5742 - 9951 - 2155
answer:
-905


question:
8974 + 8978 - 8097
answer:
8093


question:
2470 - 7695 + 9480
answer:

685