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: 6433 + 6891 + 2386 - 7923 - 2419 + 7641

Output: -143


Input: Consider Input: 2181 + 397 + 8824 - 2945 + 612 + 9971 + 1036 - 7693

Output: -8021


Input: Consider Input: 6738 - 5863 - 5287 + 6672


Output: 11216