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: 1971 - 5591 + 4038 + 5571

Output: -2047


Input: Consider Input: 8338 + 7035 - 2067 - 1210 + 9433 + 1604

Output: -6457


Input: Consider Input: 6425 - 5013 + 3405 + 7115


Output: 918


