user: Question: Which length has a Stage of 9?
Columns: ['Stage', 'Date', 'Route', 'Terrain', 'Length', 'Winner']
Types: ['text', 'text', 'text', 'text', 'text', 'text']
Sample row: ['P', '28 June', 'Plumelec', 'Individual time trial', 'km (mi)', 'Bernard Hinault ( FRA )']
SQL:

assistant: SELECT "Length" FROM "Table" WHERE "Stage" = '9';