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: " You don 't mean the one we used to picnic underneath when the children were but motels . "
Example Output: Changed

Example Input: " Just Charli , ma belle . "
Example Output: Original

Example Input: This scholar stood to the side , gazing into the fire , his expression echoing Altair 's thoughts .
Example Output:
Original