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.

a private prison is a prison run by a private company instead of the government.
private prison

in 1920 the name was changed from fv to sv werder bremen.
werder bremen

nori shih (or shih ming-teh; ; born 15 january 1941) is a taiwanese politician.

shih ming-teh