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

Output: 1115


Input: Consider Input: 3631 - 7822 - 8283 + 4667 - 697

Output: 15766


Input: Consider Input: 971 - 1330 + 569 + 4257 + 8883 + 2853 - 4798 - 8302 + 504


Output: -1665