user: Question: What is the entered office that has 1337 as the left office?
Columns: ['Throne Name', 'Title', 'Born-Died', 'Entered office', 'Left office']
Types: ['text', 'text', 'text', 'text', 'text']
Sample row: ['s Great Khan (1221–1256)', 's Great Khan (1221–1256)', 's Great Khan (1221–1256)', 's Great Khan (1221–1256)', 's Great Khan (1221–1256)']
SQL:

assistant: SELECT "Entered office" FROM "Table" WHERE "Left office" = '1337';