n = int(input())
XY = []
ee = 0
eo = 0
oe = 0
oo = 0
for i in range(n):
    x, y = map(int, input().split())
    if x%2 == 0 and y%2 == 0:
        ee += 1
    elif x%2 == 0 and y%2 == 1:
        eo += 1
    elif x%2 == 1 and y%2 == 0:
        oe += 1
    else:
        oo += 1
c = ee//2+eo//2+oe//2+oo//2
if c%2 == 1:
    print('Alice')
else:
    print('Bob')