#include <bits/stdc++.h>
using namespace std;
typedef long long int ll;
typedef pair<ll, ll> P;
typedef vector<ll> VI;
typedef vector<VI> VVI;
const ll MOD = 1000000007;
const ll INF = 2147483647;
const ll LINF = 9223372036854775807;
#define REP(i, n) for(int i = 0; i < n; i++)
#define ALL(v) v.begin(), v.end()

VVI edge(100000, VI(0));
vector<bool> f(100000, 0);

void dfs(int v, int p) {
	f[v] = 1;
	for (int i = 0; i < edge[v].size(); i++) {
		if (edge[v][i] != p && !f[edge[v][i]]) {
			dfs(edge[v][i], v);
		}
	}
}

int main() {
	int n; cin >> n;
	int a, b;
	REP(i, n - 1) {
		cin >> a >> b;
		edge[a].push_back(b);
		edge[b].push_back(a);
	}
	dfs(0, -1);
	REP(i, n - 1) {
		if (!f[i]) {
			cout << "Alice" << endl;
			return 0;
		}
	}
	cout << "Bob" << endl;
	return 0;
}