#include "bits/stdc++.h"
#define YES "YES"
#define NO "NO"
#define Yes "Yes"
#define No "No"
#define DEFAULT              \
    LL ans = solve();        \
    if (ans == NONE)         \
    {                        \
    }                        \
    else                     \
    {                        \
        cout << ans << endl; \
    }
#define YESNO three(solve(), (OUT(YES), 1), (OUT(NO), 0))
#define YesNo three(solve(), OUT(Yes), OUT(No))
#define ECHO OUT(solve())
#define three(A, B, C) ((A) ? (B) : (C))
#define FOR(i, a, b) for (LL i = (a); i < (LL)(b); i++)
#define EFOR(i, a, b) for (LL i = (a); i <= (LL)(b); i++)
#define RFOR(i, a, b) for (LL i = (b - 1); i >= (LL)(a); i--)
#define REP(i, b) FOR(i, zero, b)
#define rep REP
#define EREP(i, b) EFOR(i, zero, b)
#define RREP(i, b) RFOR(i, zero, b)
#define ALL(c) c.begin(), c.end()
#define UNIQUE(c) \
    sort(ALL(c)); \
    c.erase(unique(ALL(c)), c.end())
#define MAX(c) (*max_element(ALL(c)))
#define MIN(c) (*min_element(ALL(c)))
#define MP make_pair
#define FI first
#define SE second
#define SI(x) (LL(x.size()))
#define PB push_back
#define DEBUG(a) OUT(a)
#define DEBUG2(a, b) OUT2(a, b)
#define cat cout << __LINE__ << endl
#define OUT(a) cout << (a) << endl
#define OUT2(a, b) cout << (a) << " " << (b) << endl
#define zero 0LL
#define all ALL
#define pb emplace_back
#define eb pb
#define int long long
using namespace std;
template <typename T>
inline void maximize(T &a, T b) { a = max(a, b); }
template <typename T>
inline void minimize(T &a, T b) { a = min(a, b); }
template <typename T>
inline bool middle(T a, T b, T c) { return b <= a && a <= c; }
template <class T>
inline bool MX(T &l, const T &r) { return l < r ? l = r, 1 : 0; }
template <class T>
inline bool MN(T &l, const T &r) { return l > r ? l = r, 1 : 0; }
typedef int LL;
typedef double ld;
typedef int ut;
typedef vector<ut> VI;
typedef vector<VI> VII;
typedef pair<ut, ut> pr;
typedef pair<ut, pr> ppr;
typedef vector<pr> Vpr;
typedef vector<ppr> Vppr;
typedef tuple<int, int, int, int> tapu;
typedef vector<tapu> Vtapu;
typedef priority_queue<pr, Vpr> PQ;
inline void outputVI(VI x)
{
    REP(i, SI(x)) { cout << three(i, " ", "") << x[i]; }
    OUT("");
}
const int SIZE1 = 5e5 + 1000;
const int SIZE2 = 5010;
const int SIZE3 = 430;
const int SIZE = SIZE1;
const int MAPSIZE = 40;
const LL p998 = 998244353;
const LL p107 = 1000000007;
const LL p = p107;
const LL INF = 1LL << 60;
const long double EPS = 1e-7;
const LL NONE = -2;
#define endl "\n"
ut N, M, K, D, Q, I, S, V, F;
VI edges[SIZE];
LL vals[SIZE], answer = zero;
// LL A[SIZE],B[SIZE],C[SIZE];
LL solve()
{
    LL X, Y, K, P;
    cin >> X >> Y >> K >> P;
    LL used = (X + Y - K);
    LL last = (used + 1) % 2;
    LL able = (X + Y - K) / 2;
    if (able >= X)
    {
        LL ys = K;
        LL ans = ys % 2;
        return (P == -1 and ans == 1) or (P == 1 and ans == 0);
    }
    if (able >= Y)
    {
        return P == -1;
    }
    return last;
}
signed main()
{

    ios_base::sync_with_stdio(false);
    cout << fixed << setprecision(10);
    LL T = 1;

    REP(i, T)
    {
        cout << three(solve(), "Bob", "Alice") << endl;
    }

    //	YesNo;
    //	YESNO;
    //	three(solve(),OUT("First"),OUT("Second"));
    // cin >> N;
    return 0;
}