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.

Input: Consider Input: a black powder rocket motor pushes a model rocket using black powder.

Output: black powder rocket motor


Input: Consider Input: pakistan super league (psl) is a professional twenty20 cricket tournament in pakistan.

Output: pakistan super league


Input: Consider Input: gran canaria is one of the canary islands in the atlantic ocean.


Output: gran canaria