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: 573 - 2172 + 3067 + 6526 - 4690
Example Output: -2158

Example Input: 1078 + 2128 + 513 + 5898 - 8020
Example Output: 559

Example Input: 7427 + 8492 - 4073 + 5465 + 8192 - 9073 - 4984
Example Output:
3408