#include <bits/stdc++.h>

using namespace std;
using ll = long long;
using PII = std::pair<int, int>;
using PLL = std::pair<ll, ll>;

#define rep(i, n) for (int i = 0; i < (int)(n); i++)
#define rep2(i, s, n) for (int i = (s); i < (int)(n); i++)
#define DEBUG

int main(){
    int n, a, b;
    string ans;
    cin >> n;
    vector<int> v;
    rep(i, n)
        v.push_back(0);
    
    rep(i, n - 1)
    {
        cin >> a >> b;
        v[a]++;
        v[b]++;
    }
    
    a = b = 0;
    rep(i, n)
    {
        if (v[i] == 0)
            a++;
        else if (v[i] == 1)
            b++;
    }

    
    ans = "Alice";
    if (a == 0)
        ans = "Bob";
    else if (a == 1 && b == 0)
        ans = "Bob";
    cout << ans << endl;
    
    return 0;
}