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: nutritional value 
Words: iron, heavy, vitamin c, fat, brittleness

Ex Output:
brittleness


Ex Input:
Category: animal 
Words: flutter, fly, bats, eagle, pounce

Ex Output:
flutter


Ex Input:
Category: physical activity 
Words: sprint, cow, duck, hike, stoop

Ex Output:

cow