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:  Ipeľ (Slovak) or Ipoly (Hungarian) (German: Eipel archaic Slovak: Jupoľ ) is a 232 km long river in Slovakia and Hungary tributary to the river Danube. Its source is in central Slovakia in the Slovenské rudohorie Mountains. It flows south to the Hungarian border and then southwest west and again south along the border until it flows into the Danube near Szob. Ipeľ flows through or makes border of Banská Bystrica and Nitra regions in Slovakia and Nógrád and Pest counties in Hungary.

8