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: Reluctantly I unwrapped mine and stared at the first cheeseburger I 'd been allowed in months .
Example Output: Original

Example Input: " You 've improved your weaponry .
Example Output: Original

Example Input: Instead of pinching his nose , he 's smiling at us .
Example Output:
Original