In this task, you are given an app review. Your task is to identify whether its sentiment is "Positive" or "Negative".

Example Input: doesn't work with rtl-2832 Says it works with rtl devices but doesn't. never displays anything  even though the rtl 2832 works with other spectrum analyzers. no help files anywhere so good luck figuring out what's wrong!
Example Output: Negative

Example Input: Good and usefull
Example Output: Positive

Example Input: cool and friendly
Example Output:
Positive