App Profile: Bulls & Cows Go

At game start, slot machine generate 4 different numbers randomly. Please find the correct number.

Steps:
1. Player each time submit 4 numbers.
2. If any number match but on wrong position, get a 'B'.
3. If any number match and on right position, get a 'A'.
4. Objective is to get '4A' and win the game!

Example:
Correct Number: 1234
Player guess: 1245
The answer is: 2A1B
(Guess "1" and "2" get A and guess "4" get B.)

The slot machine is hint:
1. 0~9 total 10 numbers be replaced by constellation pictures in slot machine.
2. There are Increasing numbers in each column of the machine.
(Ex: 0..1..2..3..4..5..6..7..8..9..0..1..2...)