In this task, you are given a sentence. You must judge whether a single noun or verb has been replaced with another word with the same part of speech. The inversion would result in the sentence sounding unnatural, So unnatural sentences will be considered changed. Label the instances as "Original" or "Changed" based on your judgment.

Example Input: " I know most authors hate doing signings , but I can promise you a success !
Example Output: Original

Example Input: With a waved arm , he ensures that I should step towards one of the doors towards the back of the room .
Example Output: Changed

Example Input: " And some grenades too . "
Example Output:
Original