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: aesthetic characteristic 
Words: 70, pale, fair, light, milky

Ex Output:
70


Ex Input:
Category: poker 
Words: board, joker, deck, fold, apron

Ex Output:
apron


Ex Input:
Category: type of rigidity 
Words: common, rough, rigged, tough, firm

Ex Output:

common