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_18333678_2 (operator VARCHAR, arrival VARCHAR)
### Question:
what is the operator of trains arriving at 13.39 
### Answer:
SELECT operator FROM table_18333678_2 WHERE arrival = "13.39"