Name the date of appointment for sacked and 14th position replaced by marco kostmann
CREATE TABLE "managerial_changes" (
  "team" text,
  "outgoing_manager" text,
  "manner_of_departure" text,
  "date_of_vacancy" text,
  "replaced_by" text,
  "date_of_appointment" text,
  "position_in_table" text
);
SELECT "date_of_appointment" FROM "managerial_changes" WHERE "manner_of_departure"='Sacked' AND "position_in_table"='14th' AND "replaced_by"='Marco Kostmann';