#include <iostream>
#include <vector>
using namespace std;
int main(){
  int n;cin>>n;
  vector<int> A[100000];
  for(int i = 0; n-1 > i; i++){
    int a,b;cin>>a>>b;
    A[a].push_back(b);
    A[b].push_back(a);
  }
  int nw = 0;
  bool z = false;
  for(int i = 0; n > i; i++){
    if(0 == A[i].size()){
      nw++;
    }else if(1 == A[i].size()){
      z = true;
    }
  }
  if(nw+z > 1){
    cout << "Alice" << endl;
  }else{
    cout << "Bob" << endl;
  }
}