user: Question: result is Lost Re-election Republican Gain, what is the district?
Columns: ['District', 'Incumbent', 'Party', 'First elected', 'Result']
Types: ['text', 'text', 'text', 'real', 'text']
Sample row: ['Missouri 1', 'John Richard Barret', 'Democratic', 1858.0, 'Lost Re-election Republican Gain']
SQL:

assistant: SELECT "District" FROM "Table" WHERE "Result" = 'Lost Re-election Republican Gain';