X = [[0] * 2 for _ in range(2)]
for _ in range(int(input())):
    x, y = map(int, input().split())
    X[x % 2][y % 2] += 1
n = 0
for i in range(2):
    for j in range(2):
        n ^= ((X[i][j]//2) % 2)
if n == 0:
    print("Bob")
else:
    print("Alice")