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: 3881 + 3747 + 6493 - 7538

Output: 1179


Input: Consider Input: 5525 + 201 - 6676 - 332 - 3348

Output: 15680


Input: Consider Input: 1535 - 6646 + 569


Output: 7612