N = int(input())
a = [list(map(int, input().split())) for _ in [0]*N]
odd, even = [], []
for n, m in a:
    if n%2:
        odd.append(m)
    else:
        even.append(m)
pair = [[0, 0], [0, 0]]
for _a, p in zip((odd, even), pair):
    for n in _a:
        if n%2:
            p[0] += 1
        else:
            p[1] += 1
total = pair[0][0]//2 + pair[0][1]//2 + pair[1][0]//2 + pair[1][1]//2
print("Alice" if total%2 else "Bob")