Green Lollipops - Guess Number

Guess a 4 digit number whose digits do not repeat based off of the colors of the lollipops that display after each guess. A green lollipop is shown for each digit in your guess that is placed correctly. A yellow lollipop is shown for each correct digit that is placed incorrectly. A blank is shown for each wrong digit. Keep trying different combinations of digits until you get 4 green lollipops.