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: " What about your sciences ? "
Example Output: Changed

Example Input: " The heads of the Arab states and the Majlis have authorized me to make you an offer . "
Example Output: Original

Example Input: I spot a bunch of psychics that have managed to fall under the slotted stairs .
Example Output:
Changed