def main():
    N = int(input())
    points = []
    for i in range(N):
       x, y = map(int, input().split()) 
       points.append((x,y))
    #print(points)

    game_count = count_game_counts(points)
    #print(game_count)

    if game_count == 0:
        print("Bob")
    elif game_count % 2 == 1:
        print("Alice")
    else:
        print("Bob")

def count_game_counts(points):
    if len(points) == 0 or len(points) == 1:
        return 0

    odd_odd = 0
    odd_even = 0
    even_even = 0
    even_odd = 0

    for point in points:
        x, y = point
        if x % 2 == 0:
            if y % 2 == 0:
                even_even += 1
            else:
                even_odd += 1
        elif x % 2 == 1:
            if y % 2 == 1:
                odd_odd += 1
            else:
                odd_even += 1

    #print("even_even", even_even)
    #print("even_odd", even_odd)
    #print("odd_odd", odd_odd)
    #print("odd_even", odd_even)
    return even_even // 2 + even_odd // 2 + odd_odd // 2 + odd_even // 2

if __name__ == '__main__':
    main()