+---------+-------+
| 8 9 5 1 | R R   |       
+---------+-------+       
| 2 1 6 9 | R B   |     
+---------+-------+        
| 3 6 9 4 | R B   |        
+---------+-------+     
| 4 7 2 1 | R B   |        
+---------+-------+ 
| 1 2 3 7 | R R R |        
+---------+-------+

Each of the rows in the table given above indicates an attempt to find out the secret number. Each try has, in the column to the right, the letters R and B.

Each R indicates that this number has one digit in common with the secret number, but in a different position.

Each B indicates that this number has one digit in common with the secret number in the same position.

Determine the secret number.