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.

Ex Input:
Category: measurement unit 
Words: ounce, ear, inch, foot, milimeter

Ex Output:
ear


Ex Input:
Category: aesthetic characteristic 
Words: 70, variety, color, fair, light

Ex Output:
70


Ex Input:
Category: corporate 
Words: firm, alignment, tough, ceo, combined

Ex Output:

tough