N = int(input())
oe = oo = eo = ee = 0
for _ in range(N):
    x, y = map(int, input().split())
    if x % 2 == 0:
        if y % 2 == 0:
            ee += 1
        else:
            eo += 1
    else:
        if y % 2 == 0:
            oe += 1
        else:
            oo += 1

if (oe // 2 + oo // 2 + eo // 2 + ee // 2) % 2 == 0:
    print('Bob')
else:
    print('Alice')