#nullable enable

#region
var (_input, _iter) = (Array.Empty<string>(), 0);
T I<T>() where T : IParsable<T>
{
    while (_iter >= _input.Length) (_input, _iter) = (Console.ReadLine()!.Split(' '), 0);
    return T.Parse(_input[_iter++], null);
}
#endregion

I<int>();
var s = I<string>();
var x = 0;
foreach (var c in s)
{
    x = (x * 2) % 3;
    if (c == 'B') x = (x + 1) % 3;
}
Console.WriteLine(x == 0 ? "Bob" : "Alice");