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: bird 
Words: concrete pourer, flamingo, egret, crane, duck

Ex Output:
concrete pourer


Ex Input:
Category: boxing terminology 
Words: ring, lifeline, deck, punch, corner

Ex Output:
lifeline


Ex Input:
Category: physical activity 
Words: duck, hike, bend, pig, fall

Ex Output:

pig