Given a set of five words, generate the word from the set that does not belong (i.e. is the least relevant) with the other words. Words are separated by commas.

Ex Input:
icy, hot, cool, refreshing, relaxed

Ex Output:
relaxed


Ex Input:
organize, support, text, sort mail, file

Ex Output:
text


Ex Input:
kilometer, ankle, knee, foot, ear

Ex Output:

kilometer