import sys
input = sys.stdin.readline

sys.setrecursionlimit(10**7)

from functools import lru_cache
@lru_cache(maxsize=None)
def game(X,Y,te,now,P):
    #print(X,Y)
    if X+Y<K-3:
        X%=2
        Y%=2
        
        return game(X,Y,te,now,P)

    if X+Y>K+3:
        minus=(X+Y-K+3)

        minusX=minus*X//(X+Y)//2*2
        minusY=minus*Y//(X+Y)//2*2
        X-=minusX
        Y-=minusY

        return game(X,Y,te,now,P)
        
    if X+Y==K:
        if now==P:
            return te
        else:
            return te^1

    if te==1:
        ANS=0
        
        if X>0:
            if game(X-1,Y,te^1,now,P)==1:
                ANS=1
        if Y>0:
            if game(X,Y-1,te^1,-now,P)==1:
                ANS=1

        return ANS

    else:
        ANS=1
        
        if X>0:
            if game(X-1,Y,te^1,now,P)==0:
                ANS=0
        if Y>0:
            if game(X,Y-1,te^1,-now,P)==0:
                ANS=0

        return ANS


X,Y,K,P=map(int,input().split())

now=1
if Y%2==-1:
    now=-1

ANS=game(X,Y,0,now,P)

if ANS==0:
    print("Alice")
else:
    print("Bob")