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: For the last couple of hours , she had stayed locked in her office , scouring the internet .
Example Output: Original

Example Input: What good reason do you have for questioning my two guest 's ultimatum ? "
Example Output: Changed

Example Input: When she slammed into his back , although she knew he never sensed her coming , the big ox never even moved .
Example Output:
Original