#include <iostream>
#include <vector>
using namespace std;
typedef vector<vector<int>> graph;

bool f(graph& g, int ord[], int low[], int& k, int p, int u) {
  bool flag = false;
  ord[u] = k++;
  low[u] = ord[u];
  for (int v : g[u]) {
    if (ord[v] < 0) {
      flag = flag || f(g, ord, low, k, u, v);
      low[u] = min(low[u], low[v]);
      if (ord[u] < low[v]) flag = true;
    }
    else if (v != p) {
      low[u] = min(low[u], ord[v]);
    }
  }
  return flag;
}

int main() {
  int n;
  cin >> n;
  graph g(n);
  for (int i = 0; i < n-1; i++) {
    int u, v;
    cin >> u >> v;
    g[u].push_back(v);
    g[v].push_back(u);
  }

  int ord[n], low[n], k = 0;
  for (int i = 0; i < n; i++) ord[i] = -1;
  bool bridge1 = f(g, ord, low, k, -1, 0);
  
  int count = 1;
  bool bridge2 = false;
  for (int i = 0; i < n; i++) {
    if (ord[i] < 0) {
      bridge2 = f(g, ord, low, k, -1, i);
      count++;
    }
  }

  if (count > 2) cout << "Alice" << endl;
  else if (count == 2) {
    cout << (bridge1 || bridge2 ? "Alice" : "Bob") << endl;
  }
  else cout << "Bob" << endl;
}