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:
A simple touch , though the feelings he evoked were much more complex than simple .

Ex Output:
Original

Ex Input:
Seconds later it exploded , sending out a spray of small metal rods .

Ex Output:
Original

Ex Input:
But the mares ahead seemed to be driving themselves , refusing to deviate from the painted lines on the road despite the limited assistance from the driver .

Ex Output:
Original