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_28436909_4 (nickname VARCHAR, letters VARCHAR)
### Question:
When καθ are the letters what is the nickname?
### Answer:
SELECT nickname FROM table_28436909_4 WHERE letters = "ΚΑΘ"