N = int(input())
lis = []
binum = [0]*4
count = 0
for i in range(N):
    lis.append(list(map(int,input().split())))
for l in lis:
    if l[0] % 2 == 0:
        if l[1] % 2 == 0:
            binum[0] += 1
        else:
            binum[1] += 1
    else:
        if l[1] % 2 == 0:
            binum[2] += 1
        else:
            binum[3] += 1
for item in binum:
    count += (item//2)
if count % 2 == 0:
    print ("Bob")
else:
    print ("Alice")