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.

Example Input: 6894 + 3927 + 7884 - 4132 - 6563 + 4281
Example Output: 1497

Example Input: 2480 - 8716 + 5571 - 504 - 4905 - 392 - 5105 + 906
Example Output: 15625

Example Input: 3937 + 448 - 2357 + 7157 - 1958
Example Output:
647