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: The rock face was steep , but provided many hand and footholds to aid in climbing .
Example Output: Original

Example Input: The windows were rolled up and she thought she was going to wane .
Example Output: Changed

Example Input: The armada showed up on Barkley Lake nearly to the minute they thought it might .
Example Output:
Original