user: Question: Who was the winning team before 1956 on October 21?
Columns: ['Year', 'Date', 'Winner', 'Result', 'Loser', 'Location']
Types: ['real', 'text', 'text', 'text', 'text', 'text']
Sample row: [1950.0, 'November 26', 'New York Giants', '7-3', 'Philadelphia Eagles', 'Polo Grounds']
SQL:

assistant: SELECT "Winner" FROM "Table" WHERE "Year" < 1956.0 AND "Date" = 'October 21';