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:
klaus ebner (born august 8, 1964) is an austrian writer of short stories, essays and poetry, and a translator.

Ex Output:
klaus ebner

Ex Input:
the archbishop of canterbury is the spiritual leader of the church of england and in the anglican communion the leader of its mother church.

Ex Output:
archbishop of canterbury

Ex Input:
northwest airlines flight 255, a mcdonnell douglas md-82, crashed in romulus, michigan shortly after takeoff from detroit metropolitan wayne county airport on august 16, 1987, at about 8:46 p.m. edt (00:46 utc august 17).

Ex Output:
northwest airlines flight 255