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.

Example Input: 1971 - 5591 + 4038 + 5571
Example Output: -2047

Example Input: 7427 + 8795 - 4104 + 7720 - 6667
Example Output: 1683

Example Input: 1345 - 764 + 6775
Example Output:
-4666