#include <bits/stdc++.h>
using namespace std;

bool dfs(const vector<vector<int>> &to, vector<bool> &isvisited, int index, int prev) {
    for (int next : to.at(index)) {
        if (next == prev) continue;
        if (isvisited.at(next)) return false;
        isvisited.at(next) = true;
        if (dfs(to, isvisited, next, index) == false) return false;
    }
    return true;
}

int main() {
    int n;
    cin >> n;
    vector<vector<int>> to(n);
    for (int i = 0; i < n - 1; i++) {
        int u, v;
        cin >> u >> v;
        to.at(u).push_back(v);
        to.at(v).push_back(u);
    }
    vector<bool> isvisited(n);
    if (dfs(to, isvisited, 0, -1)) {
        cout << "Bob" << endl;
    } else {
        cout << "Alice" << endl;
    }
}