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: secretary duty 
Words: organize, support, text, sort mail, file

Ex Output:
text


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

Ex Output:
document


Ex Input:
Category: bird 
Words: crane, concrete pourer, goose, pelican, neck

Ex Output:

concrete pourer