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: 8929 - 6145 + 8551 - 1836 + 9159

Output: -800


Input: Consider Input: 7646 + 8509 - 4372 - 9840 - 6377 - 2924 + 869

Output: 21781


Input: Consider Input: 5750 - 427 + 9864 - 2747


Output: -940