import sequtils,strutils
var
    N = stdin.readline.parseInt
    x,y : int
    hyou : array[2, array[2, int]]
    ans = 0
    
for n in 1..N:
    (x, y) = stdin.readline.split.map(parseInt)
    x = x mod 2
    y = y mod 2
    hyou[x][y] += 1

for i in 0..1:
    for j in 0..1:
        ans += hyou[i][j] shr 1
if ans mod 2 == 1:
    echo "Alice"
else:
    echo "Bob"