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: 2537 - 3199 + 5925 + 8172 + 3564 + 8810
Example Output: -20735

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

Example Input: 3992 + 5587 - 6167 - 1905 + 2526 - 6655
Example Output:
10606