#define _USE_MATH_DEFINES
#include <bits/stdc++.h>
using namespace std;
const int INF = 1 << 30;
bool dfs (int cur, const vector<vector<int>>& g, vector<int>& order, vector<int>& reach) {
  bool res = false;
  reach[cur] = order[cur];
  for (int nbr : g[cur]) {
    if (order[nbr] == INF) {
      order[nbr] = order[cur] + 1;
      res |= dfs (nbr, g, order, reach);
    }
    reach[cur] = min(reach[cur], order[nbr]);
  }
  return res | (reach[cur] >= order[cur]);
}
signed main() { 
  ios::sync_with_stdio(false); cin.tie(0);
  int n;
  cin >> n;
  vector<vector<int>> g(n);
  for (int i = 0; i + 1 < n; i++) {
    int u, v;
    cin >> u >> v;
    g[u].push_back(v);
    g[v].push_back(u);
  }
  vector<int> order(n, INF);
  vector<int> reach(n, INF); 
  int c = 0;
  bool b = false;
  for (int i = 0; i < n; i++) {
    if (order[i] == INF) {
      c++;
      order[i] = 0;
      b = dfs (i, g, order, reach);
    }
  }
  if (c > 1 && b) cout << "Alice\n";
  else cout << "Bob\n";
  return 0;
}