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: 1078 + 2128 + 513 + 5898 - 8020

Output: 559


Input: Consider Input: 9982 + 267 - 3418 + 8741 - 63 - 1771 + 4720

Output: 1506


Input: Consider Input: 9089 - 9579 - 1458


Output: 20126