#include<bits/stdc++.h>
using namespace std;
#ifdef LOCAL_DEBUG
  #include "LOCAL_DEBUG.hpp"
#endif
#define int long long

struct UnionFind{
  vector<int> par; //親
  vector<int> size; //集合の大きさ

  UnionFind(int n){
    par.resize(n); size.resize(n, 1);
    for(int i = 0; i < n; i++){
      par[i] = i;
    }
  }

  //木の根を求める
  int root(int x){
    if(par[x] == x){
      return x;
    }else{
      return par[x] = root(par[x]);
    }
  }

  //xとyの属する集合を併合
  void unite(int x,int y){
    x = root(x), y = root(y);
    if(x == y) return;
    if(size[x] < size[y]) swap(x,y);
    par[y] = x;
    size[x] += size[y];
  }

  bool same(int x, int y){
    return root(x) == root(y);
  }
};

signed main(){

  int n; cin >> n;
  UnionFind uf(n);
  vector<int> indeg(n, 0);
  for(int i = 0; i < n-1; i++){
    int u, v; cin >> u >> v;
    uf.unite(u, v);
    indeg[u]++;
    indeg[v]++;
  }
  if(uf.size[uf.root(0)] == n-1){
    int cnt = 0;
    for(int i = 0; i < n; i++){
      if(indeg[i] < 2) cnt++;
    }
    cout << (cnt < 2 ? "Bob" : "Alice") << endl;
  }else{
    cout << (uf.size[uf.root(0)] == n ? "Bob" : "Alice") << endl;
  }

  return 0;
}