fn main() {
    let ref mut buf = String::new();
    std::io::Read::read_to_string(&mut std::io::stdin(), buf).ok();
    let mut iter = buf.split_whitespace();

    macro_rules! scan {
        ($t:ty) => (iter.next().unwrap().parse::<$t>().unwrap());
    }

    let mut won = false;
    for a in (0..scan!(usize)).map(|_| scan!(u32)) {
        if !won {
            won = true;
        } else if a == 1 {
            won = false;
        }
    }

    println!("{}", if won { "Alice" } else { "Bob" });
}