import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.util.ArrayList;
import java.util.List;

public class Main {
	public static void main(String[] args) throws Exception {
		BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
		String[] sa = br.readLine().split(" ");
		int n = Integer.parseInt(sa[0]);
		List<List<Integer>> list = new ArrayList<>(n);
		for (int i = 0; i < n; i++) {
			list.add(new ArrayList<>());
		}
		for (int i = 0; i < n - 1; i++) {
			sa = br.readLine().split(" ");
			int u = Integer.parseInt(sa[0]);
			int v = Integer.parseInt(sa[1]);
			list.get(u).add(v);
			list.get(v).add(u);
		}
		br.close();

		boolean[] visit = new boolean[n];
		dfs(visit, list, 0);
		for (int i = 0; i < visit.length; i++) {
			if (!visit[i]) {
				System.out.println("Alice");
				return;
			}
		}
		System.out.println("Bob");
	}

	static void dfs(boolean[] visit, List<List<Integer>> list, int x) {
		visit[x] = true;
		for (int c : list.get(x)) {
			if (!visit[c]) {
				dfs(visit, list, c);
			}
		}
	}
}