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_20 (distance VARCHAR, stage VARCHAR)
### Question:
What is the Distance of the 1945 Vuelta a Espana with 4A Stage?
### Answer:
SELECT distance FROM table_name_20 WHERE stage = "4a"