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: Mack 's breeding was a pleasant surprise .
Example Output: Changed

Example Input: They 'll be haunted for the rest of their lives by your hacking .
Example Output: Changed

Example Input: He keyed the radio .
Example Output:
Original