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:
unwarranted, fudge, pudding, lie, unlicensed

Ex Output:
pudding

Ex Input:
centimeter, yard, foot, milimeter, head

Ex Output:
head

Ex Input:
sergeant, lieutenant, fighter, general, ordinary

Ex Output:
ordinary