Generate a topic word for the given sentence. A topic word is usually the name of a person, place, animal, concept or object the sentence is focusing on.

Input: Consider Input: tactopods are members of a proposed clade of ecdysozoans called tactopoda.

Output: tactopoda


Input: Consider Input: the bucket list is a 2007 american comedy-drama movie.

Output: the bucket list


Input: Consider Input: krafla is a volcano in the north of iceland.


Output: krafla