N=int(input())
D={(a,b):0 for a in [0,1] for b in [0,1]}

for _ in range(N):
    x,y=map(int,input().split())
    x%=2
    y%=2
    D[(x,y)]+=1

T=sum([p//2 for p in D.values()])

if T%2:
    print("Alice")
else:
    print("Bob")