import random

# pile, userWins, computerWins: state
# user, computer: input 


def nim():
    global pile, computerWins, userWins
    userWins = 0
    computerWins = 0

    while True:
        pile = int(raw_input("Size: "))
        while True:
            if userMove() != "go on":
                break
            if computerMove() != "go on":
                break
        print "The score is", (userWins, computerWins)
        if raw_input("Play again?") == "no":
            break
        
def userMove():
    global pile, computerWins
    user = int(raw_input("Your turn: "))
    pile = pile - user
    if pile < 0:
        print "You lost."
        computerWins = computerWins + 1
        return "end the game"
    print "The pile becomes", pile, "computer moves now"
    return "go on"

def computerMove():
    global pile, userWins
    computer = random.randrange(10)
    print "Computer withdraws", computer
    pile = pile - computer
    if pile < 0:
        print "The computer lost."
        userWins = userWins + 1
        return "end the game"
    print "The pile becomes", pile, "it's your turn now"
    return "go on"