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:  Psou River (Abkhaz: Ҧсоу; Georgian: ფსოუ Russian: Псоу) is a river in the West Caucasus. It flows along the Southern slopes of the Greater Caucasus Mountain Range and forms a part of the border between Abkhazia and Russia or Georgia and Russia as Georgia and United Nations consider. The river flows into the Black Sea. The length of the Psou is 57 km and the drainage basin is approximately 420 km2. The Psou Valley borders the Gagra Range of Abkhazia to the east.

8