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: It 's a chance to meet , mingle , get to know other people .
Example Output: Original

Example Input: He specializes in spyware . "
Example Output: Original

Example Input: Alistair looked closer , cursing silently at the unmistakable " H " stitched in red thread .
Example Output:
Original