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:  Ceratopteridaceae is an improper family name for the clade that is now known to include the two genera Ceratopteris and Acrostichum. Although Ceratopteris was long isolated under its own family due to adaptations for a dedicated aquatic existence recent genetic study has determined that these two genera are allied.The correct name for this taxon at the level of family is Parkeriaceae.

11