#include<bits/stdc++.h>
using namespace std;
#define fast ios::sync_with_stdio(false),cin.tie(0),cout.tie(0)
#define For(i,j,k) for (int i=(j);i<=(k);i++)
#define rof(i,j,k) for (int i=(j);i>=(k);i--)
#define ull unsigned long long
#define lowbit(x) ((x)&(-(x)))
#define PII pair<int,int>
#define int long long
#define endl "\n"
#define ls rt<<1
#define rs rt<<1|1
typedef long long ll;
const int mod = 998244353;
const double eps = 1e-9;
const int N=2e6+7;
int n,m;
void solve(){
	cin>>n;
    int a[n+1]={0};
    int sor[n+1]={0};
    for(int i=1;i<=n;i++){
        int u,v;
        cin>>u>>v;
        a[u]++;
        a[v]++;

    }
    sort(a+1,a+1+n);
    if((n-a[n])%2==0)cout<<"Bob"<<endl;
    else cout<<"Alice"<<endl;
	
}
signed main(){
	int t=1;
	//cin>>t;
	while(t--){
		solve();
	}
}