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 Big Man pointed to a couple elves who 'd spent most of the trip napping in the back of the rainstorm .
Example Output: Changed

Example Input: Production lines slowed , then came to a standstill , because the workers were no longer showing up .
Example Output: Original

Example Input: I heard notebooks closing and backpacks ensuring .
Example Output:
Changed