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: guitar part 
Words: neck, strap lock, fret, angry, notes

Ex Output:
angry


Ex Input:
Category: moral characteristic 
Words: unprejudiced, unjust, milky, ok, fair

Ex Output:
milky


Ex Input:
Category: window material 
Words: metal, spoon, woodwork, glass, wood

Ex Output:

spoon