#include <iostream>
#include <vector>

using namespace std;

void dfs(vector<bool>& checked, vector<vector<int>>& path, int island) {
    checked[island] = true;
    for (auto i : path[island]) {
        if (!checked[i]) dfs(checked, path, i);
    }
}

int main() {
    int n;
    cin >> n;
    vector<vector<int>> path(n, vector<int>());
    vector<bool> checked(n, false);
    for (int i=0; i<n-1; i++) {
        int u, v;
        cin >> u >> v;
        path[u].push_back(v);
        path[v].push_back(u);
    }

    int cnt = 0;
    for (int i=0; i<n; i++) {
        if (!checked[i]) {
            cnt++;
            dfs(checked, path, i);
        }
    }

    if (cnt >= 2)
        cout << "Alice" << endl;
    else
        cout << "Bob" << endl;
}