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: 1649 + 4642 + 613 - 7051 - 8575

Output: 12020


Input: Consider Input: 138 + 3973 - 6085 - 3324 + 6921 + 4411 + 1113 + 8310

Output: -15181


Input: Consider Input: 7720 - 8526 - 7706 - 1506 - 3065 - 7988


Output: 36511