+---------+-------+
| 6 2 5 3 | R     |       
+---------+-------+       
| 8 1 4 7 | R R   |     
+---------+-------+        
| 2 5 7 1 | B     |        
+---------+-------+     
| 3 6 0 9 | R R   |        
+---------+-------+ 
| 9 6 8 7 | B B   |        
+---------+-------+

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.