CREATE TABLE table_71743 ("Position" TEXT, "Name" TEXT, "Party" TEXT, "First elected" FLOAT, "District" TEXT)

Name the party with first elected more than 1999 and position of supervisor for john foust
SELECT "Party" FROM table_71743 WHERE "First elected" > '1999' AND "Position" = 'supervisor' AND "Name" = 'john foust'
SELECT "Party" FROM "table_71743" WHERE "First elected" > '1999' AND "Name" = 'john foust' AND "Position" = 'supervisor'