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: shady activities 
Words: truffles, lie, falsehood, wrongful, fudge
Example Output: truffles

Example Input: Category: physical activity 
Words: summer, roll, plummet, fall, exercise
Example Output: summer

Example Input: Category: computers 
Words: folder, software, file, type, document
Example Output:
type