user: Question: Tell me the total number of attendance for result of l 18-6
Columns: ['Week', 'Date', 'Opponent', 'Result', 'Attendance']
Types: ['real', 'text', 'text', 'text', 'real']
Sample row: [1.0, 'September 4, 1988', 'at Buffalo Bills', 'L 13-10', 76783.0]
SQL:

assistant: SELECT SUM("Attendance") FROM "Table" WHERE "Result" = 'l 18-6';