from collections import defaultdict
from itertools import combinations
N = int(input())
li = tuple(tuple(map(int, input().split())) for _ in range(N))
MAP = defaultdict(set)
LIST = []
for i, j in combinations(li, 2):
    x = (i[0] - j[0])
    y = (i[1] - j[1])
    if abs(x) in (0, 1) or abs(y) in (0, 1): continue
    if x % 2 == 0 and y % 2 == 0:
        MAP[i].add(j)
        MAP[j].add(i)
        LIST.append({i, j})
print(*LIST, sep="\n")
cnt = 0
for fi, se in LIST:
    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
print("Bob" if cnt % 2 == 0 else "Alice")