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: aesthetic characteristic 
Words: 70, variety, color, fair, light
Example Output: 70

Example Input: Category: boxing terminology 
Words: corner, fold, deck, knockout, level
Example Output: fold

Example Input: Category: ocean 
Words: wave, current, water, belated, jetstream
Example Output:
belated