import sys
input = sys.stdin.readline

N,M=map(int,input().split())

E=[[] for i in range(N)]
E_INV=[[] for i in range(N)]


for i in range(M):
    x,y=map(int,input().split())
    x-=1
    y-=1

    E[x].append(y)
    E_INV[y].append(x)

ANS=[-1]*N
Q0=[]
Q1=[]
for i in range(N):
    if E[i]==[]:
        ANS[i]=0
        Q0.append(i)

while Q0 or Q1:
    while Q0:
        x=Q0.pop()
        for to in E_INV[x]:
            ANS[to]=1
            Q1.append(to)

    if Q1:
        x=Q1.pop()

        for to in E_INV[x]:
            if ANS[to]!=-1:
                continue

            L=set()
            for toto in E[to]:
                L.add(ANS[toto])

            if L=={1}:
                ANS[to]=0
                Q0.append(to)
                
if ANS[0]==0:
    print("Bob")
elif ANS[0]==1:
    print("Alice")
else:
    print("Draw")