// yukicoder: No.601 Midpoint Erase
// 2019.6.23 bal4u

#include <stdio.h>

#if 1
#define gc() getchar_unlocked()
#else
#define gc() getchar()
#endif

int in() {   // 非負整数の入力
	int n = 0, c = gc();
	do n = 10 * n + (c & 0xf); while ((c = gc()) >= '0');
	return n;
}

int a[4];

int main()
{
	int i, N, ans;

	N = in();
	for (i = 0; i < N; i++) {
		int x = in(), y = in();
		a[((x & 1)<< 1) + (y & 1)]++;
	}
	ans = 0;
	for (i = 0; i < 4; i++) {
		a[i] &= 3;
		if (a[i] >= 2) ans = !ans;
	}
	puts(ans? "Alice": "Bob");
	return 0;
}