#include <bits/stdc++.h>
using namespace std;
using ll = long long;
using Graph = vector<vector<int>>;
int main() {
  int N; cin >> N;
  Graph G(N);
  for(int i = 0; i < N - 1; i++) {
    int a,b; cin >> a >> b;
    G[a].push_back(b);
    G[b].push_back(a);
  }
  vector<int> dist(N,0);
  queue<int> que;
  que.push(0);
  dist[0] = 1;
  while(que.size() != 0) {
    int v = que.front();
    que.pop();
    for(int x: G[v]) {
      if(dist[x] == 1) {
        continue;
      }
      dist[x] = 1;
      que.push(x);
    }
  }
  int count = 0;
  for(int i = 0; i < N; i++) {
    if(dist[i] == 0) {
      count++;
    }
  }
  if(count == 0) {
    cout << "Bob" << endl;
  }else {
    cout << "Alice" << endl;
  }
}