Safecracker

Safecracker is a game where you must use your logic in order to guess a 4-digit secret number selected by the computer at the beginning of the game.
The number is from 0 to 9. Each digit appears once at most.
How many digits have you guessed on the same position will show by gold coins.
How many digits have you guessed on a different position will show by siver coins.
Good luck!