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:
4515 - 2156 - 8427 - 2175

Ex Output:
17273


Ex Input:
6820 - 387 + 8290 - 9203 - 9292 + 9249 - 3079

Ex Output:
11242


Ex Input:
9065 - 6207 - 5911 + 6208 + 6209

Ex Output:

8766