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: 3421 - 71 + 7643 - 8661 + 520 - 6536 + 9411

Output: 1115


Input: Consider Input: 496 + 5072 + 6259 + 1493 + 4824 + 2052 + 4751 - 8038

Output: -15917


Input: Consider Input: 3429 - 9355 - 8237 - 4457 + 8432 - 8023


Output: 25069