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.

[Q]: hans nowak (born 9 august, 1937) is a former german football player.
[A]: hans nowak


[Q]: in cryptography, a pre-shared key or psk is a shared secret which was previously shared between the two parties using some secure channel before it is used.
[A]: pre-shared key


[Q]: "indian camp" is a short story written by ernest hemingway.
[A]:
indian camp