Anikait-MasterMind

It is based on the board game mastermind.
The computer will generate a random 4 digit number.
You have to try and guess the number.

In the output:
R - Red - The correct digit in the correct place. Don't change that one digit.
W - White - Correct digit in the wrong place. Try putting it in a different place.
X - Wrong - Not in the answer at all. Remove it at once.

(The output corresponds with the input digits)

Quick note:
Zero (the number) will never be the first digit in the answer.