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: 2181 + 397 + 8824 - 2945 + 612 + 9971 + 1036 - 7693

Output: -8021


Input: Consider Input: 5299 - 8791 + 6861

Output: 7229


Input: Consider Input: 459 + 3795 + 9927 - 2342 + 1467 - 5292 - 4179


Output: -2917