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: 3394 - 2316 - 9713
Example Output: 15423

Example Input: 3421 - 71 + 7643 - 8661 + 520 - 6536 + 9411
Example Output: 1115

Example Input: 4870 + 6561 - 9473 - 8691 + 8238 + 8677 + 2071 - 3005
Example Output:
492