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.

Ex Input:
3129 - 7101 - 6763 + 9310 + 4977

Ex Output:
2706

Ex Input:
395 - 3060 - 445 + 3450 + 3365

Ex Output:
-2915

Ex Input:
2433 - 3251 - 3306 + 1917 - 7642 + 9634 - 3088 + 8422

Ex Output:
-253