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.

Input: Consider Input: 8171 + 8357 + 171 - 3129 - 6929

Output: 9701


Input: Consider Input: 3069 + 3141 - 6765 + 85 - 9346 + 8391 + 121 + 7644

Output: -202


Input: Consider Input: 8769 - 3041 - 6567 + 1136 + 3380 + 4191 + 2049 + 7794 - 4291


Output: 4118