Below is an instruction that describes a task. Write a response that appropriately completes the request.

### Instruction:
What is the 1999 for an A 1991, and a 1r 1997?

### Inputs:
table_name: table, columns: ['Tournament', '1988', '1990', '1991', '1992', '1993', '1995', '1996', '1997', '1998', '1999', '2000', '2001', 'Career SR', 'Career Win-Loss']

### Response:
SELECT 1999 FROM table WHERE 1991 = a AND 1997 = 1r