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: ignace murwanashyaka (14 may 1963 – 16 april 2019) was a rwandan rebel leader.

Output: ignace murwanashyaka


Input: Consider Input: euclid's lemma, also called euclid's division lemma or euclid's first theorem, is an important lemma.

Output: euclid's lemma


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


Output: the bucket list