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.

Input: Consider Input: 2514 - 3539 - 8491 + 7351 - 1448

Output: 8641


Input: Consider Input: 9491 + 8647 - 4571 + 8815 - 4816 - 8552 + 1794

Output: 8174


Input: Consider Input: 8919 - 8115 - 8836


Output: 25870