#include <iostream>
#include <string>
#include <vector>
#include <algorithm>
#include <functional>
#include <cmath>
#include <iomanip>
#include <stack>
#include <queue>
#include <numeric>
#include <map>
#include <unordered_map>
#include <set>
#include <fstream>
#include <chrono>
#include <random>
#include <bitset>
#define rep(i,n) for(int i=0;i<(n);i++)
#define all(x) x.begin(), x.end()
#define rall(x) x.rbegin(), x.rend()
#define sz(x) ((int)(x).size())
#define pb push_back
#define mod 1000000007
using ll = long long;
using namespace std;
ll gcd(ll a, ll b) {return b?gcd(b,a%b):a;}
ll lcm(ll a, ll b) {return a/gcd(a,b)*b;}

int main(){
  int N; cin >> N;
  vector<vector<int>> tree(N);
  int a,b;
  rep(i,N-1){
    cin >> a >> b;
    tree[a].pb(b); tree[b].pb(a);
  }
  vector<int> d(N,-1);
  queue<int> q;
  q.push(0); d[0] = 0;
  while(!q.empty()){
    int now = q.front(); q.pop();
    rep(i,sz(tree[now])){
      if(d[tree[now][i]]>=0) continue;
      q.push(tree[now][i]);
      d[tree[now][i]] = d[now]+1;
    }
  }
  rep(i,N){
    if(d[i]<0) {
      cout << "Alice" << endl;
      return 0;
    }
  }
  cout << "Bob" << endl;
  return 0;
}