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 Q]: in 1920 the name was changed from fv to sv werder bremen.
[EX A]: werder bremen

[EX Q]: rupert thorne is a fictional batman character, who is the crime boss of batman.
[EX A]: rupert thorne

[EX Q]: vielsalm is a municipality in the belgian province of luxembourg.
[EX A]:
vielsalm