import sys
from collections import defaultdict
from itertools import combinations
readline = sys.stdin.readline
f = lambda x, y: (True if (x[0] - y[0]) % 2 == 0 and (x[0] - y[0]) not in (-1, 0, 1) and
                          (x[1] - y[1]) % 2 == 0 and (x[1] - y[1]) not in (-1, 0, 1) else False)
N = int(input())
li = tuple(tuple(map(int, readline().split())) for _ in range(N))
MAP = defaultdict(set)
LIST = []
for x, y in ((i, j) for i, j in combinations(li, 2) if f(i, j)):
    MAP[x].add(y)
    MAP[y].add(x)
    LIST.append({x, y})
cnt = 0
dp = [LIST[0]] if LIST else []
while dp:
    fi, se = dp.pop()
    if MAP[fi] and MAP[se]:
        for z in MAP[fi]:
            MAP[z].remove(fi)
            if not MAP[z]:
                del MAP[z]
        for z in MAP[se]:
            MAP[z].remove(se)
            if not MAP[z]:
                del MAP[z]
        del MAP[fi]
        del MAP[se]
        cnt += 1
    if MAP:
        t = tuple(MAP)[0]
        dp.append((t, min(MAP[t])))
print("Bob" if cnt % 2 == 0 else "Alice")