Crazy Numbers

Purpose of this game is finding number that has 4 digits different from each others.

How to play?
In every game, computer will set an unknown number. For example, this unknown numver may be 1453. To find the number, you should guess. For example, you said 4652. Than computer will give you two digits. One of them is (+), another one is (-). This meaning is that; You found only two digits, but ones place is true like 5, anothers place is false like 4. You should continue to guess and use this hints untill find a number. Less guess and less time is better. On the other hand lower score is better than higher.