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: 7272 + 8958 - 7231 + 6616

Output: -1071


Input: Consider Input: 2443 + 7109 + 4711

Output: -9377


Input: Consider Input: 7686 - 9467 - 2726


Output: 19879