//https://qiita.com/tanakh/items/0ba42c7ca36cd29d0ac8 より
macro_rules! input {
    (source = $s:expr, $($r:tt)*) => {
        let mut iter = $s.split_whitespace();
        input_inner!{iter, $($r)*}
    };
    ($($r:tt)*) => {
        let s = {
            use std::io::Read;
            let mut s = String::new();
            std::io::stdin().read_to_string(&mut s).unwrap();
            s
        };
        let mut iter = s.split_whitespace();
        input_inner!{iter, $($r)*}
    };
}

macro_rules! input_inner {
    ($iter:expr) => {};
    ($iter:expr, ) => {};
    ($iter:expr, $var:ident : $t:tt $($r:tt)*) => {
        let $var = read_value!($iter, $t);
        input_inner!{$iter $($r)*}
    };
}

macro_rules! read_value {
    ($iter:expr, ( $($t:tt),* )) => {
        ( $(read_value!($iter, $t)),* )
    };
    ($iter:expr, [ $t:tt ; $len:expr ]) => {
        (0..$len).map(|_| read_value!($iter, $t)).collect::<Vec<_>>()
    };
    ($iter:expr, chars) => {
        read_value!($iter, String).chars().collect::<Vec<char>>()
    };
    ($iter:expr, usize1) => {
        read_value!($iter, usize) - 1
    };
    ($iter:expr, $t:ty) => {
        $iter.next().unwrap().parse::<$t>().expect("Parse error")
    };
}

//

use std::cmp::min;

fn dfs(v: usize, parent: usize, g: &[Vec<usize>], ord: &mut [usize], lowlink: &mut [usize], id: &mut usize) {
    ord[v] = *id;
    lowlink[v] = *id;
    *id += 1;
    for &u in g[v].iter() {
        if ord[u] == g.len() {
            dfs(u, v, g, ord, lowlink, id);
            lowlink[v] = min(lowlink[v], lowlink[u]);
        } else if u != parent {
            lowlink[v] = min(lowlink[v], ord[u]);
        }
    }
}

fn run() {
    input! {
        n: usize,
        e: [(usize, usize); n - 1],
    }
    let mut g = vec![vec![]; n];
    for &(a, b) in e.iter() {
        g[a].push(b);
        g[b].push(a);
    }
    let mut ord = vec![n; n];
    let mut lowlink = vec![n; n];
    let mut components = 0;
    let mut id = 0;
    for r in 0..n {
        if ord[r] == n {
            components += 1;
            dfs(r, r, &g, &mut ord, &mut lowlink, &mut id);
        }
    }
    let mut bridge = false;
    for (a, b) in e {
        if ord[a] < lowlink[b] || ord[b] < lowlink[a] {
            bridge = true;
        }
    }
    if components >= 3 || (components == 2 && bridge) {
        println!("Alice");
    } else {
        println!("Bob");
    }
}

fn main() {
    run();
}