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.

3421 - 71 + 7643 - 8661 + 520 - 6536 + 9411
1115

8171 + 8357 + 171 - 3129 - 6929
9701

807 - 7683 + 446 + 6653 + 7940 - 9984 - 1806

5241