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:
1137 - 2413 - 5470 - 9797 + 2566

Ex Output:
16251


Ex Input:
9096 - 7913 + 7375 + 7790

Ex Output:
1844


Ex Input:
145 - 1532 - 6014 - 7946 - 5083 + 3849 - 4565

Ex Output:

21436