//
// Created by yamunaku on 2020/01/31.
//

#include <bits/stdc++.h>

using namespace std;

#define rep(i, n) for(int i = 0; i < (n); i++)
#define repl(i, l, r) for(int i = (l); i < (r); i++)
#define per(i, n) for(int i = ((n)-1); i >= 0; i--)
#define perl(i, l, r) for(int i = ((r)-1); i >= (l); i--)
#define all(x) (x).begin(),(x).end()
#define MOD9 998244353
#define MOD1 1000000007
#define IINF 1000000000
#define LINF 1000000000000000000
#define SP <<" "<<
#define CYES cout<<"Yes"<<endl
#define CNO cout<<"No"<<endl
#define CFS cin.tie(0);ios::sync_with_stdio(false)
#define CST(x) cout<<fixed<<setprecision(x)

using ll = long long;
using ld = long double;
using vi = vector<int>;
using mti = vector<vector<int>>;
using vl = vector<ll>;
using mtl = vector<vector<ll>>;
using pi = pair<int, int>;
using pl = pair<ll, ll>;
template<typename T>
using heap = priority_queue<T, vector<T>, function<bool(const T, const T)>>;

int main(){
    // CFS;
    int n;
    cin >> n;
    mti e(n);
    rep(i, n - 1){
        int u, v;
        cin >> u >> v;
        e[u].push_back(v);
        e[v].push_back(u);
    }
    vi f(n, false);
    vi c(n, 0), ec(n, 0);
    int count = 0;
    rep(i, n){
        if(!f[i]){
            count++;
            c[i] = 1, ec[i] = 0;
            f[i] = true;
            queue<int> q;
            q.push(i);
            while(!q.empty()){
                int x = q.front();
                q.pop();
                for(auto &nx:e[x]){
                    ec[i]++;
                    if(f[nx]) continue;
                    f[nx] = true;
                    q.push(nx);
                    c[i]++;
                }
            }
        }
    }
    if(count == 1){
        cout << "Bob" << endl;
        return 0;
    }
    if(count > 2){
        cout << "Alice" << endl;
        return 0;
    }
    rep(i, n){
        if(c[i] > 0){
            if(c[i] == ec[i] / 2 && c[i] == n - 1){
                f = vi(n, false);
                queue<int> q;
                f[i] = true;
                q.push(i);
                while(!q.empty()){
                    int x = q.front();
                    q.pop();
                    if(e[x].size()!=2){
                        cout << "Alice" << endl;
                        return 0;
                    }
                    for(auto &nx:e[x]){
                        if(f[nx]) continue;
                        f[nx] = true;
                        q.push(nx);
                    }
                }
                cout << "Bob" << endl;
                return 0;
            }
        }
    }
    cout << "Alice" << endl;
    return 0;
}