#include <iostream>
#include <set>
#include <vector>
using namespace std;
//B
struct UnionFind {
  vector<int> par;
  int N;
  UnionFind(int n) : N(n),par(n){
    for(int i = 0; n > i; i++)par[i] = i;
  }

  int root(int n){
    if(par[n] == n)return n;
    return par[n] = root(par[n]);
  }

  void unite(int a,int b){
    int ra = root(a);
    int rb = root(b);
    if(ra==rb)return;
    par[ra] = rb;
  }

  bool same(int a, int b){
    return root(a) == root(b);
  }
  int size(){
    set<int> A;
    for(int i = 0; N > i; i++){
      A.insert(root(i));
    }
    return A.size();
  }
  int rootsize(){
    int re = 0;
    for(int i = 1; N > i; i++){
      if(same(0,i))re++;
    }
    return re+1;
  }

};
//E
int main(){
  int n;cin>>n;
  UnionFind A(n);
  vector<int> Z[100000];
  for(int i = 0; n-1 > i; i++){
    int a,b;cin>>a>>b;
    A.unite(a,b);
    Z[a].push_back(b);
    Z[b].push_back(a);
  }
  if(A.size() == 2){
    //片方の島が1つだけかつ閉路時はBob
    if(A.rootsize() == 1 || A.rootsize() == n-1){
      int hotoke = 1;
      for(int i = 0; n > i; i++){
        if(Z[i].size() != 2)hotoke--;
        if(hotoke < 0){
          break;
        }
      }
      if(hotoke < 0){
        cout << "Alice" << endl;
      }else{
        cout << "Bob" << endl;
      }
    }else{
      cout << "Alice" << endl;
    }
  }else if(A.size() == 1){
    cout << "Bob" << endl;
  }else{
    cout << "Alice" << endl;
  }
}