Nim is a simple game where the second player─if they know the trick─will always win.


The game has only 3 rules:
::*   start with   '''12'''   tokens
::*   each player takes    '''1,  2,  or  3'''   tokens in turn
::*  the player who takes the last token wins.


To win every time,   the second player simply takes 4 minus the number the first player took.   So if the first player takes 1,   the second takes 3; if the first player takes 2,   the second should take 2; and if the first player takes 3,   the second player will take 1. 

;Task:
Design a simple Nim game where the human player goes first, and the computer always wins. The game should enforce the rules.