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_21205 ( "Episode number Production number" text, "Title" text, "Sydney" real, "Melbourne" real, "Brisbane" real, "Adelaide" real, "Perth" real, "TOTAL" real, "WEEKLY RANK" text, "NIGHTLY RANK" text )

### Question ###
what is the nightly rank where the episode number production number is 06 1-06?

### Accurate SQL ###

SELECT COUNT("NIGHTLY RANK") FROM table_21205 WHERE "Episode number Production number" = '06 1-06'