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_name_50 (date VARCHAR, ground VARCHAR, opponent VARCHAR)
### Question:
What is the date ground A and Cartagena as an opponent?
### Answer:
SELECT date FROM table_name_50 WHERE ground = "a" AND opponent = "cartagena"