N = int(input())

B = [0] * N

G = []
for i in range(N):
    G.append([False] * N)

for i in range(N-1):
    u, v = list(map(int, input().split()))
    B[u] += 1
    B[v] += 1
    G[u][v] = True
    G[v][u] = True

# print(G)

no_b = 0
for bi in B:
    if bi == 0:
        no_b += 1

# print(B)

if no_b == 0:
    visited = [False] * N
    def dfs(v):
        if visited[v]:
            return
        visited[v] = True
        edges = G[v]
        for i, e in enumerate(edges):
            if e:
                dfs(i) 

    dfs(0)
    print(visited)
    if all(visited):
        print('Bob')
    else:
        print('Alice')
elif no_b == 1:
    ans = True
    for bi in B:
        if bi != 2:
            ans = False
    if ans:
        print('Bob')
    else:
        print("Alice")
else:
    print("Alice")