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: animals 
Words: duck, jog, cat, pig, mallet

Ex Output:
jog


Ex Input:
Category: secretary duty 
Words: answer calls, file, correspondence, document, fax

Ex Output:
document


Ex Input:
Category: weather 
Words: fair, 70, well, raining, endure

Ex Output:

well