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: 6439 - 6685 + 6156 - 3314 + 6845 - 6872

Output: 10309


Input: Consider Input: 769 - 7763 + 4853 - 1702


Output: 5381