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: 42 + 6517 - 146 + 304 - 4759 + 148 - 3822

Output: 1800


Input: Consider Input: 6649 - 4594 - 3159 + 3198 + 5080 - 909 + 8544 + 9873


Output: -11384