N = int(input())
A = [list(map(int,input().split())) for _ in range(N)]
X0 = set()
X1 = set()
Y0 = set()
Y1 = set()
for i in range(N):
    x,y = A[i]
    if x%2==0:
        X0.add(i)
    else:
        X1.add(i)
    if y%2==0:
        Y0.add(i)
    else:
        Y1.add(i)
A00 = X0&Y0
A01 = X0&Y1
A10 = X1&Y0
A11 = X1&Y1
n = len(A00)//2+len(A01)//2+len(A10)//2+len(A11)//2
if n%2==0:
    print("Bob")
else:
    print("Alice")