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: emotional status 
Words: emotional, ground, ashamed, emotional upsets, down

Ex Output:
ground


Ex Input:
Category: mode of transportation 
Words: bee, swim, fly, car, walk

Ex Output:
bee


Ex Input:
Category: emotional status 
Words: disgusted, miserable, emotionalities, backward, down

Ex Output:

backward