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: animal
Words: flutter, swim, ant, fly, bats

Ex Output:
flutter

Ex Input:
Category: emotional status
Words: fret, emotional supports, output cord, angry, concerned

Ex Output:
output cord

Ex Input:
Category: location (proximity)
Words: shut down, on top of, close, closest, nearest

Ex Output:
shut down