#include <iostream>
#include <algorithm>
#include <iomanip>
#include <vector>
#include <queue>
#include <deque>
#include <set>
#include <map>
#include <tuple>
#include <cmath>
#include <numeric>
#include <functional>
#include <cassert>

#define debug_value(x) cerr << "line" << __LINE__ << ":<" << __func__ << ">:" << #x << "=" << x << endl;
#define debug(x) cerr << "line" << __LINE__ << ":<" << __func__ << ">:" << x << endl;

template<class T> inline bool chmax(T& a, T b) { if (a < b) { a = b; return 1; } return 0; }
template<class T> inline bool chmin(T& a, T b) { if (a > b) { a = b; return 1; } return 0; }

using namespace std;
typedef long long ll;

template<typename T>
vector<vector<T>> vec2d(int n, int m, T v){
    return vector<vector<T>>(n, vector<T>(m, v));
}

template<typename T>
vector<vector<vector<T>>> vec3d(int n, int m, int k, T v){
    return vector<vector<vector<T>>>(n, vector<vector<T>>(m, vector<T>(k, v)));
}

template<typename T>
void print_vector(vector<T> v, char delimiter=' '){
    if(v.empty()) {
        cout << endl;
        return;
    }
    for(int i = 0; i+1 < v.size(); i++) cout << v[i] << delimiter;
    cout << v.back() << endl;
}

bool ok[305][305][605][2];
bool win[305][305][605][2];

bool solve(int x, int y, int k, int p){
    int pp = p == 1 ? 1 : 0;
    if(ok[x][y][k][pp]) return win[x][y][k][pp];
    if(x+y == k) return p == 1;
    if(x > 0 && !solve(x-1, y, k, -p)) win[x][y][k][pp] = true;
    if(y > 0 && !solve(x, y-1, k, p)) win[x][y][k][pp] = true;
    ok[x][y][k][pp] = true;
    return win[x][y][k][pp];
}

bool solve0(int x, int y, int k, int p){
    if(x+y == k) return p == 1;
    int used = x+y-k;
    if(used%2 == 0){ // 最後がBob
        int c = used/2;
        if(x > c && y > c) return false;
        if(x <= c){
            // 残りk個の-1
            int q = (y-k)%2 == 0 ? 1 : -1;
            if(p == q) return true;
        }
        if(y <= c){
            int q = y%2 == 0 ? 1 : -1;
            if(p == q) return true;
        }
        return false;
    }else{ // 最後がAlice
        if(x > 0 && !solve0(x-1, y, k, -p)) return true;
        if(y > 0 && !solve0(x, y-1, k, p)) return true;
        return false;
    }
}


void test(int n){
    for(int x = 1; x <= n; x++){
        for(int y = 1; y <= n; y++){
            for(int k = 1; k < x+y; k++){
                for(int p: {-1, 1}){
                    if(solve(x, y, k, p) != solve0(x, y, k, p)) cout << x << ' ' << y << ' ' << k << ' ' << p << ' ' << solve(x, y, k, p) << ' ' << solve0(x, y, k, p) << endl;
                }
            }
        }
    }
}

int main(){
    ios::sync_with_stdio(false);
    cin.tie(0);
    cout << setprecision(10) << fixed;
    // test(300);
    int x, y, k, p; cin >> x >> y >> k >> p;
    if(solve0(x, y, k, p)) cout << "Alice" << endl;
    else cout << "Bob" << endl;

}