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:
heron, davit, egret, derrick, crane

Ex Output:
davit

Ex Input:
shareholders, alignment, firm, sustainability, solid

Ex Output:
solid

Ex Input:
suits, deck, board, fold, stern

Ex Output:
stern