user: Question: What is the area of the community with a census ranking of 636 of 5,008?
Columns: ['Official Name', 'Status', 'Area km 2', 'Population', 'Census Ranking']
Types: ['text', 'text', 'real', 'real', 'text']
Sample row: ['Grand Falls/Grand-Sault', 'Town', 18.06, 5706.0, '636 of 5,008']
SQL:

assistant: SELECT "Area km 2" FROM "Table" WHERE "Census Ranking" = '636 of 5,008';