fn main() {
    let mut xykp = String::new();
    std::io::stdin().read_line(&mut xykp).ok();
    let xykp: Vec<isize> = xykp.trim().split_whitespace().map(|s| s.parse().unwrap()).collect();
    let x = xykp[0];
    let y = xykp[1];
    let k = xykp[2];
    let p = xykp[3];

    let cnt = (x+y-k)/2;
    let alice_last = (x+y-k) % 2 == 1;
    if x.min(y) > cnt {
        if alice_last {
            println!("Alice");
        } else {
            println!("Bob");
        }
    } else if p == -1 {
        if x.min(y) == x && k % 2 == 1 {
            println!("Alice");
        } else {
            println!("Bob");
        }
    } else {
        if x.min(y) == y || k % 2 == 0 {
            println!("Alice");
        } else {
            println!("Bob");
        }
    }
    
}