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

void f(graph& g, bool c[], int node) {
  c[node] = true;
  for (int i : g[node]) {
    if (c[i] == false) {
      f(g, c, i);
    }
  }
}

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);
  }

  bool c[n] = {};
  f(g, c, 0);
  
  bool flag = true;
  for (int i = 0; i < n; i++) {
    if (c[i] == false) flag = false;
  }

  cout << (!flag ? "Alice" : "Bob") << endl; 
}