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: physical activity 
Words: bend, jog, get down, duck, pig

Ex Output:
pig


Ex Input:
Category: window material 
Words: glass, coating, panel, spatula, lead

Ex Output:
spatula


Ex Input:
Category: direction 
Words: downward, down, ashamed, ground, falling

Ex Output:

ashamed