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: 8137 + 5006 - 7743 + 1478

Output: 9396


Input: Consider Input: 6667 - 31 + 1584 - 1542 - 6475 + 9319 + 2509 - 1895

Output: 3198


Input: Consider Input: 8436 - 7542 + 9592 + 8923


Output: -2537