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: 3709 + 206 - 4363 + 3129 + 2506

Output: 2231


Input: Consider Input: 1837 - 6362 - 226

Output: 8425


Input: Consider Input: 3991 - 1416 - 8171 + 5010 - 9919


Output: 18487