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:
format, image, fax, file, folder

Ex Output:
fax


Ex Input:
fat, ugly, sugar, salt, protein

Ex Output:
ugly


Ex Input:
soar, cockroach, ant, fly, eagle

Ex Output:

soar