(define (read-point n)
  (let loop ([ee 0]
             [eo 0]
             [oe 0]
             [oo 0]
             [c n])
    (if (zero? c)
        (values ee eo oe oo)
        (let* ([x (read)]
               [y (read)])
          (cond [(and (even? x) (even? y)) (loop (+ ee 1) eo oe oo (- c 1))]
                [(and (even? x) (odd? y)) (loop ee (+ eo 1) oe oo (- c 1))]
                [(and (odd? x) (even? y)) (loop ee eo (+ oe 1) oo (- c 1))]
                [else (loop ee eo oe (+ oo 1) (- c 1))])
          ))))

(define (main args)
  (let ([n (read)])
    (print
     (receive
      (ee eo oe oo)
      (read-point n)
      (let ([c (+ (quotient ee 2)
                  (quotient eo 2)
                  (quotient oe 2)
                  (quotient oo 2))])
        (if (odd? c) "Alice" "Bob")))))
  0)