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: 573 - 2172 + 3067 + 6526 - 4690

Output: -2158


Input: Consider Input: 2443 + 7109 + 4711

Output: -9377


Input: Consider Input: 9887 - 8 + 3577


Output: 6318