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...)