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_53 (rank INTEGER, nation VARCHAR, silver VARCHAR)
### Question:
Which Rank has a Nation of south korea, and a Silver larger than 0?
### Answer:
SELECT SUM(rank) FROM table_name_53 WHERE nation = "south korea" AND silver > 0