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:  Allegheny River Lock and Dam No. 7 is a historic lock and dam complex located at East Franklin Township Pennsylvania and Kittanning in Armstrong County Pennsylvania. It was built between 1928 and 1930 by the United States Army Corps of Engineers and consists of the lock dam esplanade and Operations Building. The lock measures 56 feet by 360 feet and has a lift of 13.0 feet. The dam measures approximately 20 feet high and 916 feet long.

7