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: boats 
Words: chips, crew, bow, deck, bridge

Ex Output:
chips


Ex Input:
Category: military rank 
Words: regular, major, general, soldier, cadet

Ex Output:
regular


Ex Input:
Category: construction 
Words: davit, crane, concrete pourer, excavator, ostrich

Ex Output:

ostrich