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.

Ex Input:
6567 + 2835 + 6725

Ex Output:
-2993


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

Ex Output:
-15181


Ex Input:
2754 - 6541 - 7324 + 6093 - 365 + 6712

Ex Output:

4179