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]: the embassy of russia in copenhagen is the embassy of russia to denmark.
[EX A]: embassy of russia in copenhagen

[EX Q]: strawberry shortcake is a doll.
[EX A]: strawberry shortcake

[EX Q]: war tax due stamp is a kind of war tax and postage due stamps that was used for mail when the war tax has not been paid by the sender.
[EX A]:
war tax due stamp