CREATE TABLE table_55710 ("Region" TEXT, "Date" FLOAT, "Label" TEXT, "Format" TEXT, "Catalog" TEXT)

What is the format for the album under the label, luaka bop, that had a catalog number of 3645 and dated after 1981?
SELECT "Format" FROM table_55710 WHERE "Catalog" = '3645' AND "Date" > '1981' AND "Label" = 'luaka bop'
SELECT "Format" FROM "table_55710" WHERE "Catalog" = '3645' AND "Date" > '1981' AND "Label" = 'luaka bop'