import java.util.Scanner;

class Main {
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		int N = sc.nextInt(), x, y, sum = 0, tmp[] = new int[4];
		for (int i = 0; i < N; ++i) {
			x = sc.nextInt();
			y = sc.nextInt();
			if (x % 2 == 0 && y % 2 == 0) ++tmp[0];
			else if (x % 2 == 0 && y % 2 == 1) ++tmp[1];
			else if (x % 2 == 1 && y % 2 == 0) ++tmp[2];
			else ++tmp[3];
		}
		sc.close();
		for (int i = 0; i < 4; ++i) sum += tmp[i] / 2;
		if (sum % 2 == 0) System.out.print("Bob");
		else System.out.print("Alice");
	}
}