#yuki_601
n=int(raw_input())
oe=[[0 for i in xrange(2)] for j in xrange(2)]
for i in xrange(n):
 x,y=map(int,raw_input().split())
 oe[x%2][y%2]+=1
res=0
for i in xrange(2):
 for j in xrange(2):
  res+=oe[i][j]/2
print 'Alice' if res%2 else 'Bob'