#include<bits/stdc++.h>
#define rep(i,a,b) for(int i=int(a);i<int(b);++i)
using namespace std;
typedef long long ll;
int INF = (1LL << 30) - 1;
int MOD = 1e9+7;
main(){
    int N;
    cin >> N;
    int cnt[4] = {}; //00 : 10 : 01 : 11
    rep(i,0,N){
        int a,b;
        cin >> a >> b;
        cnt[(a&1) + ((b&1)*2)]++;
    }
    int ans = 0;
    rep(i,0,4){
        ans += cnt[i] / 2;
    }
    if(ans & 1)cout << "Alice" << endl;
    else       cout << "Bob" << endl;
}