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 journalist ( Nationality VARCHAR, Years_working VARCHAR )

### Question ###
What is the nationality of the journalist with the largest number of years working?

### Accurate SQL ###

SELECT Nationality FROM journalist ORDER BY Years_working DESC LIMIT 1