user: Question: What is the format for the album under the label, Luaka Bop, that had a catalog number of 3645 and dated after 1981?
Columns: ['Region', 'Date', 'Label', 'Format', 'Catalog']
Types: ['text', 'real', 'text', 'text', 'text']
Sample row: ['Worldwide', 1981.0, 'Warner Bros.', 'LP', '3645']
SQL:

assistant: SELECT "Format" FROM "Table" WHERE "Catalog" = '3645' AND "Date" > 1981.0 AND "Label" = 'Luaka Bop';