Below is the list of tables from the database along with their columns and datatype. Need to generate an accurate SQL query for the question.
Only use the columns present in the respective table. Only use the columns which are required to generate the SQL query. Only use table joins if required and not otherwise.

### Tables ###
TABLE: CREATE TABLE table_19744915_18 ( rank INTEGER, result VARCHAR, public VARCHAR )

### Question ###
When 8 is the public and the result is safe what is the highest rank?

### Accurate SQL ###

SELECT MAX(rank) FROM table_19744915_18 WHERE result = "Safe" AND public = 8