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: painting is using colours to make art.

Output: painting


Input: Consider Input: colonel archibald gracie iv (january 17, 1859 – december 4, 1912) was an american writer, amateur historian, real estate investor, and survivor of the sinking of the r.m.s titanic.

Output: archibald gracie iv


Input: Consider Input: firooz bahram high school is one of tehran's oldest high schools.


Output: firooz bahram high school