// ???
#include<iostream>
#include<vector>
using namespace std;

// 簡易UF
struct UF{
    vector<int> p;
    int n;

    UF(int siz){
        n = siz;
        p.resize(n, 0);
        for(int i = 0; i < n; i++)  p[i] = i;
    }

    int parent(int x){
        if(p[x] != x)   p[x] = parent(p[x]);
        return p[x];
    }

    bool same(int x, int y){
        return parent(x) == parent(y);
    }
    
    void unite(int x, int y){
        x = parent(x), y = parent(y);
        p[x] = y;
    }
};

int main(){
    int n;
    cin >> n;
    UF uf(n);
    vector<int> deg(n, 0);
    for(int i = 0; i < n-1; i++){
        int u, v;
        cin >> u >> v;
        deg[u]++, deg[v]++;
        uf.unite(u, v);
    }
    if(n == 2){
        cout << "Alice" << endl;
        return 0;
    }else if(n == 3){
        cout << "Bob" << endl;
        return 0;
    }
    int alone = 0;
    for(int i = 0; i < n; i++)  alone += deg[i]==0;
    if(alone == 1 && n == 4){
        cout << "Bob" << endl;
        return 0;
    }
    int p = uf.parent(0);
    for(int i = 1; i < n; i++){
        if(p != uf.parent(i)){
            cout << "Alice" << endl;
            return 0;
        }
    }
    cout << "Bob" << endl;
    return 0;
}