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:
8974 + 8978 - 8097

Ex Output:
8093


Ex Input:
2036 + 7313 - 8908 - 1870 - 5159 + 5945 + 5006 + 635 + 5551

Ex Output:
-6477


Ex Input:
995 + 6856 + 867 - 7415 - 9581

Ex Output:

10268