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

vector<vector<int>> G;
vector<bool> V;

void dfs(const vector<vector<int>> &G, int v) {
  V.at(v) = true;
  for (auto next : G.at(v)) {
    if (V.at(next)) continue;
    dfs(G, next);
  }
}

int main() {
  int N;
  cin >> N;
  G.resize(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;
  V.assign(N, false);
  for (int v = 0; v < N; v++) {
    if (V.at(v)) continue;
    dfs(G, v);
    cnt++;
  }
  cout << ((cnt > 1) ? "Alice" : "Bob") << "\n";
}