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: 1137 - 2413 - 5470 - 9797 + 2566
Example Output: 16251

Example Input: 9982 + 267 - 3418 + 8741 - 63 - 1771 + 4720
Example Output: 1506

Example Input: 4904 - 4187 - 9002 + 2949 - 2691
Example Output:
17835