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: type of sandwich 
Words: club, open-faced, convention, doorstep, roll

Ex Output:
convention


Ex Input:
Category: window material 
Words: panel, translucent fabric, spatula, metal, glass

Ex Output:
spatula


Ex Input:
Category: moral characteristic 
Words: frank, stern, hot dog, loyalty, matter of fact

Ex Output:

hot dog