#include <stdio.h>
#include <string>
#include <cstring>
#include <stdlib.h>
#include <math.h>
#include <algorithm>
#include <vector>
#include <set>
#include <map>
#include <queue>
#include <stack>
#include <list>
#include <iterator>
#include <assert.h>
#include <time.h>
#pragma warning(disable:4996) 
 
typedef long long ll;
#define MIN(a, b) ((a)>(b)? (b): (a))
#define MAX(a, b) ((a)<(b)? (b): (a))
#define LINF 9223300000000000000
#define INF 2140000000
const long long MOD = 1000000007;
//const long long MOD = 998244353;
 
using namespace std;

 
int main(int argc, char* argv[])
{
    int n;
    scanf("%d", &n);
    vector<vector<int> > g(n);
    int i;
    for(i=0; i<n-1; i++) {
        int a,b;
        scanf("%d%d", &a, &b);
        g[a].push_back(b);
        g[b].push_back(a);
    }
    int cnt=0;
    for(i=0; i<n; i++) {
        if(g[i].size()==0) cnt++;
    }
    if(cnt>0) {
        printf("Alice\n");
    }
    else {
        printf("Bob\n");
    }

    return 0;
}