#define _USE_MATH_DEFINES
#include <iostream>
#include <fstream>
#include <sstream>
#include <string>
#include <cstring>
#include <vector>
#include <set>
#include <map>
#include <unordered_map>
#include <queue>
#include <deque>
#include <stack>
#include <algorithm>
#include <bitset>
#include <cmath>
#include <cstdlib>
#include <ctime>
#include <numeric>
#include <functional>
#include <cctype>
#include <list>
#include <limits>
#include <cassert>
#include <random>
#include <time.h>
#include <unordered_set>

using namespace std;
using Int = long long;

constexpr double EPS = 1e-10;
constexpr long long MOD = 1000000007;

long long mod_pow(long long x, long long n) {
    long long res = 1;
    for (int i = 0;i < 60; i++) {
        if (n >> i & 1) res = res * x % MOD;
        x = x * x % MOD;
    }
    return res;
}

long long my_mod_pow(long long x, long long n) {
	long long ret = 1;
	for (; n > 0; n >>= 1, x = x * x % MOD) {
		if (n & 1) {
			ret = ret * x % MOD;
		}
	}
	return ret;
}

template<typename T>
T gcd(T a, T b) {
    return b != 0 ? gcd(b, a % b) : a;
}

template<typename T>
T lcm(T a, T b) {
    return a * b / gcd(a, b);
}

void fastInput() {
    cin.tie(0);
    ios::sync_with_stdio(false);
}

vector<int> connected_component;
vector<vector<int>> G;

int dfs(int crt) {
    for (int i = 0; i < G[crt].size(); i++) {
        int next_v = G[crt][i];
        if (connected_component[next_v] == -1) {
            connected_component[next_v] = connected_component[crt];
            dfs(next_v);
        }
    }
    return 0;
}

vector<pair<int, int> > bridge;
vector<int> articulation;
int ord[1000000], low[1000000];
bool vis[1000000];

void dfs(int v, int p, int &k)
{
	vis[v] = true;
	
	ord[v] = k++;
	low[v] = ord[v];
	
	bool isArticulation = false;
	int ct = 0;
	
	for (int i = 0; i < G[v].size(); i++){
		if (!vis[G[v][i]]){
			ct++;
			dfs(G[v][i], v, k);
			low[v] = min(low[v], low[G[v][i]]);
			if (~p && ord[v] <= low[G[v][i]]) isArticulation = true;
			if (ord[v] < low[G[v][i]]) bridge.push_back(make_pair(min(v, G[v][i]), max(v, G[v][i])));
		}
		else if (G[v][i] != p){
			low[v] = min(low[v], ord[G[v][i]]);
		}
	}
	
	if (p == -1 && ct > 1) isArticulation = true;
	if (isArticulation) articulation.push_back(v);
}

int main(void) {
    int N; cin >> N;
    connected_component = vector<int> (N, -1);
    G = vector<vector<int>>(N);

    for (int i = 0; i < N-1; i++) {
        int u, v; cin >> u >> v;
        G[u].push_back(v);
        G[v].push_back(u);
    }

    int cnt = 0;
    for (int i = 0; i < N; i++) {
        if (connected_component[i] == -1) {
            connected_component[i] = cnt;
            dfs(i);
            cnt++;
        }
    }

    if (cnt >= 3) {
        cout << "Alice" << endl;
        return 0;
    }
    if (cnt == 1) {
        cout << "Bob" << endl;
        return 0;
    }

    int k = 0;
    for (int i = 0; i < N; i++) {
        if (!vis[i]) dfs(i, -1, k);
    }
    if (cnt == 2) {
        if (bridge.size() == 0) {
            cout << "Bob" << endl;
        } else {
            cout << "Alice" << endl;
        }
        return 0;
    }
}