/* -*- coding: utf-8 -*-
 *
 * 2103.cc:  No.2103 ﾂｱ1s Game - yukicoder
 */

#include<cstdio>
#include<algorithm>

using namespace std;

/* subroutines */

bool check(int x, int y, int k, int p) {
  int n = x + y - k;
  if (n & 1) {
    bool f1 =
      (x > 0 && check(x - 1, y, k, -p)) ||
      (y > 0 && check(x, y - 1, k, -p));
    return ! f1;
  }

  int h = n / 2;
  if (y <= h) return p > 0;
  if (x <= h) return ((y & 1) == (p > 0 ? 0 : 1));
  return false;
}

/* main */

int main() {
  int x, y, k, p;
  scanf("%d%d%d%d", &x, &y, &k, &p);

  bool f0 = check(x, y, k, p);
  if (f0) puts("Alice");
  else puts("Bob");

  return 0;
}