Below is an context that describes a sql query, paired with an question that provides further information. Write an answer that appropriately completes the request.  # noqa: E501
### Context:
CREATE TABLE table_28164986_4 (date_of_appointment VARCHAR, manner_of_departure VARCHAR, team VARCHAR)
### Question:
when was the next coach appointed after niger tornadoes fired their coach?
### Answer:
SELECT date_of_appointment FROM table_28164986_4 WHERE manner_of_departure = "fired" AND team = "Niger Tornadoes"