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: geographical property 
Words: flat, horizontal, smooshed, elevation, house

Ex Output:
house


Ex Input:
Category: bird 
Words: davit, egret, heron, crane, swift

Ex Output:
davit


Ex Input:
Category: consumer product 
Words: content, ecstatic, thing, shop, merchandise

Ex Output:

ecstatic