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.

Ex Input:
As they expand they can add more stoves . "

Ex Output:
Original


Ex Input:
The other students were determined to master the representative and then never use it again .

Ex Output:
Changed


Ex Input:
In a few moments , an elderly architect with a hook nose opened the door and peered out .

Ex Output:

Changed