import java.util.*;

public class Main {
  public static void main(String[] args) {
    Scanner sc = new Scanner(System.in);
    int n = sc.nextInt();
    int[] a = new int[4];
    for(int i = 0; i < n; i++) {
      int x = sc.nextInt();
      int y = sc.nextInt();
      if((x % 2) == 0) {
        if((y % 2) == 0) {
          a[0]++;
        } else {
          a[1]++;
        }
      } else {
        if((y % 2) == 0) {
          a[2]++;
        } else {
          a[3]++;
        }
      }
    }
    String ans = "Alice";
    int p = a[0] / 2 + a[1] / 2 + a[2] / 2 + a[3] / 2;
    if((p % 2) == 0) ans = "Bob";
    System.out.println(ans);
  }
}