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_name_33 (route INTEGER, rank VARCHAR, mountain_pass VARCHAR)

### Question ###
What is the route that has a rank higher than 63, and Separation Summit as its mountain pass?

### Accurate SQL ###

SELECT SUM(route) FROM table_name_33 WHERE rank > 63 AND mountain_pass = "separation summit"