Nim game

You are encouraged to solve this task according to the task description, using any language you may know.
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.




print("There are twelve tokens.")
print("You can take 1, 2, or 3 on your turn.")
print("Whoever takes the last token wins.\n")
 
var tokens = 12 
while tokens > 0 {
    print("There are \(tokens) remaining.")
    print("How many do you take?")
    var playertake = Integer(readLine())
 
    if playertake < 1 || playertake > 3 {
        print("1, 2, or 3 only.")
    } else {
        tokens -= playertake
        print("I take \(4 - playertake).")
        tokens -= (4 - playertake)
    }
}
 
print("I win again.")