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_10402018_1 (london VARCHAR, us_tour VARCHAR)

### Question ###
How many characters is by Babs Rubenstein?

### Accurate SQL ###

SELECT COUNT(london) FROM table_10402018_1 WHERE us_tour = "Babs Rubenstein"