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.

Input: Consider Input: 4515 - 2156 - 8427 - 2175

Output: 17273

Input: Consider Input: 6020 + 1977 + 708 + 1899 + 3704

Output: -2268

Input: Consider Input: 1296 + 9756 + 2493 + 9940 - 5147 - 5428 - 5741 - 828
Output: -3749