Given a category and a set of five words, find the word from the set that does not belong (i.e. is the least relevant) with the other words in the category. Words are separated by commas.

Example Input: Category: computers 
Words: errands, file, download, text, folder
Example Output: errands

Example Input: Category: animal 
Words: bird, fish, fly, drive, eagle
Example Output: drive

Example Input: Category: animal 
Words: cow, horse, fish, hiking, goat
Example Output:
hiking