n, m = map(int, input().split())
g = [[] for i in range(n)]
deg = [0] * n
for _ in range(m):
    u, v = map(int, input().split())
    u -= 1
    v -= 1
    g[v].append(u)
    deg[u] += 1

# 0 負け 1 勝ち
dp = [0] * n

visited = [0] * n
q = []
for i in range(n):
    if deg[i] == 0:
        q.append(i)
# 遷移先に負けがあったら勝

while q:
    x = q.pop()
    visited[x] = 1
    for y in g[x]:
        if visited[y]:
            continue
        deg[y] -= 1
        if dp[x] == 0:
            dp[y] = 1
            q.append(y)
        elif deg[y] == 0:
            dp[y] = 0
            q.append(y)

# print(dp)
if not visited[0]:
    print("Draw")
elif dp[0]:
    print("Alice")
else:
    print("Bob")