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:  Gosaba River (Bengali: গোসাবা নদী) is a tidal estuarine river in and around the Sundarbans in South 24 Parganas district in the Indian state of West Bengal.The Gosaba River formed by the confluence of the Raimangal and the Matla rivers has a broad estuary to the sea (Bay of Bengal).

8