function rand (min, max)
{
    if (max === undefined) {
        max = min;
        min = 0;
    }

    var diff = max - min + 1;

    return (Math.floor (Math.random () * diff) + min);
}

function public_answer (answer)
{
    return hex_sha1 (answer.toLowerCase ().replace ("\r\n", "\n"));
}