import sys, random
input = lambda : sys.stdin.readline().rstrip()


write = lambda x: sys.stdout.write(x+"\n"); writef = lambda x: print("{:.12f}".format(x))
debug = lambda x: sys.stderr.write(x+"\n")
YES="Yes"; NO="No"; pans = lambda v: print(YES if v else NO); INF=10**18
LI = lambda : list(map(int, input().split())); II=lambda : int(input()); SI=lambda : [ord(c)-ord("a") for c in input()]
def debug(_l_):
    for s in _l_.split():
        print(f"{s}={eval(s)}", end=" ")
    print()
def dlist(*l, fill=0):
    if len(l)==1:
        return [fill]*l[0]
    ll = l[1:]
    return [dlist(*ll, fill=fill) for _ in range(l[0])]

x,y,k,p = list(map(int, input().split()))
num = x+y-k
p = pow(-1,y)*p
if p==1:
    if num%2==0:
        m = min(x,y)
        if m>=num//2+1:
            v = 0
        else:
            v = (m+1)%2
    else:
        if min(x,y)>=(num+1)//2:
            v = 1
        elif x>y:
            v = (y+1)%2
        else:
            v = (x)%2
else:
    if num%2==0:
        m = min(x,y)
        if m>=num//2+1:
            v = 0
        else:
            v = m%2
    else:
        m = min(x,y)
        if m>=(num+1)//2:
            v = 1
        elif x>y:
            v = (y)%2
        else:
            v = (x+1)%2
YES = "Alice"
NO = "Bob"
pans(v)