You will be given a definition of a task first, then some input of the task.
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.

Text: The NS Class 3400 diesel multiple units were built by Duewag Talbot and SIG between 1996 and 1998. They operate in the Netherlands. They are operated by the Nederlandse Spoorwegen and some are currently on loan to Syntus. The class is referred to as DM'90 or Buffel by the Dutch which means Buffalo. Class 3400 are now the only DMUs in service with the NS. DM'90 is short for Dieselmaterieel 90 meaning Diesel rolling stock from the 1990s.
Output:
6