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.

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

Ex Output:
ignace murwanashyaka


Ex Input:
the corruption perceptions index is an index that shows how corrupt certain countries are.

Ex Output:
corruption perceptions index


Ex Input:
svenska dagbladet is a newspaper in sweden.

Ex Output:

svenska dagbladet