Definition: In this task, you are given a text which is the body of a document. Your job is to classify the topic of the document into these categories: 1)Company, 2)Educational Institution, 3)Artist, 4)Athlete, 5)Office Holder, 6)Mean of transportation, 7)Building, 8)Natural place, 9)Village, 10)Animal, 11)Plant, 12)Album, 13)Film, 14)Written work. Your output should be the category number. Don't generate anything apart from numbers 1-14.
Input: Text:  The Toei 12-000 series (東京都交通局12-000形) is an electric multiple unit (EMU) train type operated by the Tokyo Metropolitan Bureau of Transportation (Toei) on the Toei Ōedo Line in Tokyo Japan.

6