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: Late at night on their second full day they sat and waited for a modification .
Example Output: Original

Example Input: Alan stepped toward Marcus , the barrel of the AR-15 digging into his cassock .
Example Output: Changed

Example Input: His shirt and kegs were soaked with sweat , and had been all day , but his arms were like steel .
Example Output:
Changed