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: 1420 - 1910 - 3500 + 9535 + 3807 - 5009 - 1271 - 3426
Example Output: 3194

Example Input: 8171 + 8357 + 171 - 3129 - 6929
Example Output: 9701

Example Input: 1017 - 3224 + 7426 + 2822 - 4460
Example Output:
-1547