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: " Almost everything is paid for with vouchers or coupons that you buy from a guard . "
Example Output: Original

Example Input: Victor shook his head in disagreement but he said nothing .
Example Output: Original

Example Input: All were heavily reinforced and disguised from the outside .
Example Output:
Original