#include <bits/stdc++.h>
using namespace std;

int main() {
  int N;
  cin >> N;
  vector<vector<int>> G(N);
  for (int i = 0, a, b; cin >> a >> b; i++)
    G.at(a).push_back(b), G.at(b).push_back(a);
  int cnt = 0;
  for (int i = 0; i < G.size(); i++) if (!G.at(i).size()) cnt++;
  cout << ((cnt > 1) ? "Alice" : "Bob") << "\n";
}