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: " What about your sciences ? "
Example Output: Changed

Example Input: And my brethren , " again with the sweep of his arm , " wishing simply to be free to be vampires . "
Example Output: Original

Example Input: " I 'm not going to ruin their experience by turning into a used car salesman . "
Example Output:
Original