N = int(input())
UV = [list(map(int, input().split())) for _ in range(N-1)]

comp = [-1] * N
compn = [0] * N
G = [[] for _ in range(N)]
for i in range(N-1):
    u, v = UV[i]
    G[u].append(v)
    G[v].append(u)
    compn[u] += 1
    compn[v] += 1

def dfs(now):
    for nxt in G[now]:
        if comp[nxt] != -1:
            continue
        comp[nxt] = comp[now]
        dfs(nxt)

cnt = 0
for i in range(N):
    if comp[i] != -1:
        continue
    cnt += 1
    comp[i] = cnt
    dfs(i)
    
if max(comp) == 1:    
    print('Bob')
elif max(comp) >= 3:
    print('Alice')
else:
    if all([False if x == 1 else True for x in compn]):
        print('Bob')
    else:
        print('Alice')