#include <iostream>
#include <vector>
#include <algorithm>
#include <cmath>
#include <queue>
#include <string>
#include <map>
#include <set>
#include <stack>
#include <tuple>
#include <deque>
#include <numeric>
#include <bitset>
#include <iomanip>
#include <cassert>
#include <chrono>
#include <random>
#include <limits>
#include <iterator>
#include <functional>
#include <sstream>
#include <complex>
using namespace std;

#define chmax(x, y) x = max(x, y)
#define chmin(x, y) x = min(x, y)

typedef long long ll;
typedef uint64_t ull;
typedef pair<int, int> P;
typedef pair<int, double> Pid;
typedef pair<double, int> Pdi;
typedef pair<ll, int> Pl;
typedef pair<int, pair<int, int>> PP;
typedef pair<P, int> PPi;
constexpr double PI = 3.1415926535897932;   // acos(-1)
constexpr double EPS = 1e-9;
constexpr int INF = 1001001001;
constexpr int mod = 1e+9 + 7;
// constexpr int mod = 998244353;

template<typename G>
struct LowLink{
    const G& g;
    vector<int> visited, order, low;
    vector<int> articulation;           // 関節点
    vector<pair<int, int>> bridge;      // 橋 (order[from] < low[to])
    int LinkSize = 0;

    LowLink(const G &g) : g(g) {}

    int dfs(int from, int k, int par = -1){
        visited[from] = true;
        order[from] = k++;
        low[from] = order[from];
        bool is_articulation = false;
        int cnt = 0;
        for(auto &to : g[from]){
            if(!visited[to]){
                ++cnt;
                k = dfs(to, k, from);
                low[from] = min(low[from], low[to]);
                // 頂点 from がDFS木の根以外であるときの関節点となる条件
                is_articulation |= ~par && low[to] >= order[from];
                // (from, to) が条件を満たせば、橋に追加
                if(order[from] < low[to]) bridge.emplace_back(minmax(from, (int)to));
            }
            else if(to != par){
                low[from] = min(low[from], order[to]);
            }
        }
        // 頂点 from がDFS木の根であるときの関節点となる条件
        is_articulation |= par == -1 && cnt > 1;
        if(is_articulation) articulation.push_back(from);
        return k;
    }

    virtual void build(){
        visited.assign(g.size(), 0);
        order.assign(g.size(), 0);
        low.assign(g.size(), 0);
        int k = 0;
        for(int i = 0; i < g.size(); ++i){
            if(!visited[i])    k = dfs(i, k), ++LinkSize;
        }
    }
};

using G = vector<vector<int>>;
G graph;

int main(){
    ios::sync_with_stdio(false);
    cin.tie(nullptr);

    int n;
    cin >> n;
    graph.resize(n);
    for(int i = 0; i < n - 1; ++i){
        int u, v;
        cin >> u >> v;
        graph[u].push_back(v);
        graph[v].push_back(u);
    }
    LowLink<G> lowlink(graph);
    lowlink.build();
    int LinkSize = lowlink.LinkSize;
    if(LinkSize == 1){
        puts("Bob");
        return 0;
    }
    if(LinkSize >= 3){
        puts("Alice");
        return 0;
    }

    int BridgeSize = lowlink.bridge.size();
    if(BridgeSize == 0) puts("Bob");
    else    puts("Alice");
}