user: Question: what is the no when the distance is 4168km?
Columns: ['No', 'Origin City (Country)', 'Destination City (Country)', 'Train Name No', 'Operator Name', 'Distance', 'No. of Stops', 'Frequency', 'Scheduled running time']
Types: ['real', 'text', 'text', 'text', 'text', 'text', 'text', 'text', 'text']
Sample row: [1.0, 'Moscow ( Russia )', 'Vladivostok ( Russia )', 'Rossiya 002', 'Russian Railways', '9259km', '67', 'Alternate days', '178 hrs (~7 days)']
SQL:

assistant: SELECT "No" FROM "Table" WHERE "Distance" = '4168km';