MASTERMIND
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Mastermind is a number-guessing game . The computer will select a four-
figure number and you will be given ten chances to guess the number.
After each guess you will be told how many numbers are correct and in
the correct position and how many are correct and in the wrong position.
X is used to show the numbers in the correct position and O to show the
numbers in the wrong position
   e.g    X X O    ( 2 numbers correct in correct position
                   - 1 number correct but in wrong position )
          O O O    ( 3 numbers correct but in wrong position )
          
          X        ( 1 number correct in the correct position )