Bulls and Cows game

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This is the game "Bulls and Cows". Its description can be found here:
https://en.wikipedia.org/wiki/Bulls_and_Cows .

Start the game by saying:
"Alexa, tell Bulls Cows to start a game".

The goal is to guess a secret number of 4 digits. Take a guess by saying 4 digits. You will get the result of your attempt in the form:
"The result is 2 bulls and 1 cow".

Try to discover all 4 secret digits and their right positions.

You can ask for the game rules by saying:
"explain the rules" or "how can I play".

For the current options ask:
"what can I do now" or "what are the options"

Also you can resign or stop the game.

Your moves and the corresponding results will be also shown in the Echo companion app.