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:
Then he walked rapidly to the nightstand and snatched up his wristwatch .

Ex Output:
Original


Ex Input:
" Okay , maybe a thousand , " the man said quickly , backtracking .

Ex Output:
Original


Ex Input:
" I come in , and he slugs me .

Ex Output:

Changed