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.

Example Input: goldhanger is a village and civil parish in maldon district, essex, england.
Example Output: goldhanger

Example Input: børge rosenbaum (3 january 1909 – 23 december 2000), known professionally as victor borge , was a danish-american comedian, conductor, and pianist.
Example Output: victor borge

Example Input: tat-1 (transatlantic no. 1) was the first submarine transatlantic telephone cable system.
Example Output:
tat-1