use std::io::*;

fn dfs(
    g: &Vec<Vec<usize>>,
    used: &mut [bool],
    ord: &mut [usize],
    low: &mut [usize],
    cnt: &mut usize,
    v: usize,
    p: usize,
    k: &mut usize,
) -> usize {
    used[v] = true;
    ord[v] = *k;
    low[v] = *k;
    *k += 1;
    for &nv in g[v].iter() {
        if !used[nv] {
            *k = dfs(&g, used, ord, low, cnt, nv, v, k);
            low[v] = std::cmp::min(low[v], low[nv]);
            if ord[v] < low[nv] {
                *cnt += 1;
            }
        } else if nv != p {
            low[v] = std::cmp::min(low[v], ord[nv])
        }
    }
    *k
}

fn main() {
    let mut s: String = String::new();
    std::io::stdin().read_to_string(&mut s).ok();
    let mut itr = s.trim().split_whitespace();
    let n: usize = itr.next().unwrap().parse().unwrap();

    let mut g = vec![Vec::new(); n];
    for _ in 0..n - 1 {
        let a: usize = itr.next().unwrap().parse().unwrap();
        let b: usize = itr.next().unwrap().parse().unwrap();
        g[a].push(b);
        g[b].push(a);
    }

    let mut con = 0;
    let mut cnt = 0;
    let mut k = 0;
    let mut used = vec![false; n];
    let mut ord = vec![0; n];
    let mut low = vec![0; n];
    for i in 0..n {
        if !used[i] {
            con += 1;
            k = dfs(&g, &mut used, &mut ord, &mut low, &mut cnt, i, 0, &mut k);
        }
    }
    if con >= 3 || (con == 2 && cnt > 0) {
        println!("Alice",);
    } else {
        println!("Bob",)
    }
}