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: On each side of the head , near the ears , grew an antenna through which it tagged with others .
Example Output: Changed

Example Input: His purple pulses matched his hat and ballooned at the thighs .
Example Output:
Changed