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:
8157 - 2717 - 1214 + 8558 + 7391 - 7163 + 6203 - 6912

Ex Output:
4011


Ex Input:
7388 - 3073 - 1891 + 2180 + 1361 - 9381 + 566 - 2665

Ex Output:
20291


Ex Input:
4934 - 6228 + 1424 + 761

Ex Output:

8977