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: Then he walked rapidly to the nightstand and snatched up his wristwatch .
Example Output: Original

Example Input: But let me ask you a question : For how long do these pleasures you speak of last ?
Example Output: Original

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