#include <bits/stdc++.h>
using namespace std;
using ll = long long;

int main(){
 
    cin.tie(0); ios::sync_with_stdio(0);
    int n;
    cin >> n;
    map<int, int> d;
    for(int i = 0; i < n-1; ++i){
        int u, v;
        cin >> u >> v;
        d[u]++; d[v]++;
    }
    int one = 0, two = 0;
    for(auto [_, x]  : d){
        if(x == 1) ++one;
        if(x == 2) ++two;
    }
    if(one == 2 and two == n-2){
        cout << "Bob" << '\n';
    }else{
        cout << "Alice" << '\n';
    }
    
    return 0;
}