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: 2653 + 9718 - 3237 + 2973 - 6895 - 18

Output: 112

Input: Consider Input: 6738 - 471 + 8724

Output: -1515

Input: Consider Input: 3935 + 4203 - 8723 - 3567 - 5674 + 9240 - 810 + 4795
Output: 4471