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.

Example Input: egret, mallet, tackle, davit, crane
Example Output: tackle

Example Input: mallet, winch, parrot, winch, crane
Example Output: winch

Example Input: crew, ring, deck, blocking, punch
Example Output:
crew