x,y,k,p = map(int,input().split())

turn = x+y-k

first = (turn+1)//2
second = turn//2

if turn%2:
    first,second = second,first


def ans(x,turn):
    turn %= 2
    if x == 0:
        print("Bob" if turn else "Alice")
    else:
        print("Bob" if turn == 0 else "Alice")
    exit()

if first >= y and int(p == 1)^(turn%2):
    ans(0,turn)
    
if first >= x and int(pow(-1,(y-(turn-x))%2) == p)^(turn%2):
    ans(0,turn)

ans(1,turn)