#include<bits/stdc++.h>
using namespace std;
using Int = long long;
template<typename T1,typename T2> inline void chmin(T1 &a,T2 b){if(a>b) a=b;}
template<typename T1,typename T2> inline void chmax(T1 &a,T2 b){if(a<b) a=b;}


struct UnionFind{
  Int num;
  vector<Int> rs,ps;
  UnionFind(){}
  UnionFind(Int n):num(n),rs(n,1),ps(n,0){iota(ps.begin(),ps.end(),0);}
  Int find(Int x){
    return (x==ps[x]?x:ps[x]=find(ps[x]));
  }
  bool same(Int x,Int y){
    return find(x)==find(y);
  }
  void unite(Int x,Int y){
    x=find(x);y=find(y);
    if(x==y) return;
    if(rs[x]<rs[y]) swap(x,y);
    rs[x]+=rs[y];
    ps[y]=x;
    num--;
  }
  Int size(Int x){
    return rs[find(x)];
  }
  Int count() const{
    return num;
  }
};


template<typename T> void drop(const T &x){cout<<x<<endl;exit(0);}

//INSERT ABOVE HERE
signed main(){
  Int n;
  cin>>n;
  UnionFind uf(n);
  vector<Int> deg(n);
  for(Int i=1;i<n;i++){
    Int a,b;
    cin>>a>>b;
    uf.unite(a,b);
    deg[a]++;
    deg[b]++;
  }
  if(uf.count()==1) drop("Bob");
  if(uf.count()==3) drop("Alice");
  if(uf.count()==2&&*max_element(deg.begin(),deg.end())==2)
    for(Int i=0;i<n;i++)
      if(uf.size(i)==i) drop("Bob");

  assert(0);
  drop("Alice");
  return 0;
}