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: But let me ask you a question : For how long do these pleasures you speak of last ?
Example Output: Original

Example Input: A hard lecturing , and it was taking Marian longer to recover .
Example Output: Changed

Example Input: At the lower end , lily pads and reeds concealed the out flow .
Example Output:
Original