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: weather 
Words: equitable, fair, windy, cold, raining
Example Output: equitable

Example Input: Category: bird 
Words: davit, egret, heron, crane, swift
Example Output: davit

Example Input: Category: computers 
Words: sort mail, software, file, format, motherboard
Example Output:
sort mail