use std::io::Read;
use std::collections::{HashMap, HashSet};

fn main() {
    let mut all_data = String::new();
    std::io::stdin().read_to_string(&mut all_data).ok();
    let all_data: Vec<&str> = all_data.trim().split('\n').map(|s| s.trim()).collect();
    let n: usize = all_data.iter().next().unwrap().parse().unwrap();
    let mut island2bridges: HashMap<usize, usize> = HashMap::new();
    let mut parents: Vec<Option<usize>> = vec![None; n];
    all_data.iter().skip(1).take(n).for_each(|s| {
        let ab: Vec<usize> = s.split_whitespace().map(|i| i.parse::<usize>().unwrap()).collect();
        let mut a = ab[0];
        let mut b = ab[1];
        while parents[a].is_some() {
            a = parents[a].unwrap();
        }
        while parents[b].is_some() {
            b = parents[b].unwrap();
        }
        if a != b {
            parents[b] = Some(a);
        }
        ab.iter().for_each(|i| {
            if let Some(x) = island2bridges.get_mut(&i) {
                *x += 1;
            } else {
                island2bridges.insert(*i, 1);
            }
        });
    });
    for i in 0..n {
        let mut start = i;
        while parents[start].is_some() {
            start = parents[start].unwrap();
        }
        if start != i {
            parents[i] = Some(start);
        }
    }
    let none_count = n - island2bridges.len();
    let diff_count = parents.iter().filter(|i| i.is_some()).collect::<HashSet<&Option<usize>>>().len();

    if none_count + diff_count == 1 {
        println!("Bob");
    } else if none_count + diff_count >= 3 {
        println!("Alice");
    } else {
        if island2bridges.values().min().unwrap() == &1 {
            println!("Alice");
        } else {
            println!("Bob");
        }
    }
}