#include<bits/stdc++.h>
#define int long long
#define endl '\n'
using namespace std;
void solve()
{
    int n;
    cin>>n;
    vector<int> deg(n+1);
    for(int i=1;i<=n;i++)
    {
        int u,v;
        cin>>u>>v;
        deg[v]++;
        deg[u]++;
    }
    int flag=0;
    for(int i=1;i<=n;i++)
    {
        if(deg[i]==(i-1)*2) flag=1;
    }
    if(flag) cout<<"Bob\n";
    else cout<<"Alice\n";
}
signed main()
{
    cin.tie(0)->sync_with_stdio(0);
    int t=1;
    while(t--) solve();
    return 0;
}