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

Example Input: I grabbed my weapons , sheathed them , and reverted back to my normal form .
Example Output: Original

Example Input: Farther down in the transcript , I discover another detail .
Example Output:
Original