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.

6738 - 471 + 8724
-1515

3337 + 9906 + 9733 - 853 + 5075 - 2064 + 9450 - 3886
-24024

2809 - 5004 - 5703 - 2751 - 7010 + 8558 - 2042 - 662 - 3308

20731