Teacher: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.
Teacher: Now, understand the problem? Solve this instance: 3839 - 8343 - 3366 + 9432 + 4687 + 2441 - 89
Student:
-923