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:
The invitation into the computer room was the straw that broke the camel 's back .

Ex Output:
Original


Ex Input:
She had been trying to narrow down a new definition , mathematically stated , of quantum probability .

Ex Output:
Original


Ex Input:
I would have never tried to fix a mistake of this magnitude like this .

Ex Output:

Original