#include <bits/stdc++.h>

using namespace std;

#define FOR(i, a, b) for(int i = (a); i < (b); i++)
#define RFOR(i, a, b) for(int i = (a) - 1; i >= (b); i--)
#define SZ(a) int(a.size())
#define ALL(a) a.begin(), a.end()
#define PB push_back
#define MP make_pair
#define F first
#define S second

typedef long long LL;
typedef vector<int> VI;
typedef pair<int, int> PII;
typedef double db;


int main()
{
	ios::sync_with_stdio(0); 
	cin.tie(0);
	cout << fixed << setprecision(15);
	
	int n;
	cin >> n;
	VI cnt(n, 0);
	FOR(i, 0, 2 * (n - 1))
	{
		int a;
		cin >> a;
		cnt[a - 1]++;
	}
	int res = 0;
	FOR(i, 0, n)
		if(cnt[i] > 1)
			res++;
	
	if(res % 2 == 0)
		cout << "Alice\n";
	else
		cout << "Bob\n";
	
	
	return 0;
}