#include<bits/stdc++.h>
#include<iostream>
using namespace std;
using LL = long long;
//using P = pair<int,int>;
using Graph = vector<vector<int>>;
const long long LINF = 1LL << 60;
#define all(x) (x).begin(), (x).end()
#define rep(i,n) for(int i = 0; i < (n); ++i)
template<class T>void chmin(T&a, T b){if(a > b) a = b;}
template<class T>void chmax(T&a, T b){if(a < b) a = b;}

int X, Y, K, P;
int main(){
  cin >> X >> Y >> K >> P;
  bool flag = true;
  if(P==1){
    if(Y%2==0) flag = true;
    else flag = false;
  }
  else{
    if(Y%2==0) flag = false;
    else flag = true;
  }
  if(flag) cout << "Alice" << endl;
  else cout << "Bob" << endl;
}