TASK DEFINITION: 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.
PROBLEM: the kiwi is a bird from new zealand.

SOLUTION: kiwi

PROBLEM: 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.

SOLUTION: pre-shared key

PROBLEM: sir john soane (10 september 1753 – 20 january 1837) was an english architect.

SOLUTION:
john soane