import sys
input = sys.stdin.readline

def Find(x, par):
  if par[x] < 0:
    return x
  else:
    # 経路圧縮
    par[x] = Find(par[x], par)
    return par[x]

def Unite(x, y, par, rank):
  x = Find(x, par)
  y = Find(y, par)

  if x != y:
    # rankの低い方を高い方につなげる
    if rank[x] < rank[y]:
      par[y] += par[x]
      par[x] = y
    else:
      par[x] += par[y]
      par[y] = x
      if rank[x] == rank[y]:
        rank[x] += 1

def Same(x, y, par):
  return Find(x, par) == Find(y, par)

def Size(x, par):
  return -par[Find(x, par)]

n = int(input())
g = [[] for _ in range(n)]

par = [-1]* n
rank = [0]*n

for i in range(n-1):
    u, v = map(int, input().split())
    g[u].append(v)
    g[v].append(u)
    Unite(u, v, par, rank)

s = 0
for i in range(n):
    if par[i] < 0:
        s += 1
if s == 1:
    print('Bob')
elif s >= 3:
    print('Alice')
else:
    for i in range(n):
        if len(g[i]) != 0 and len(g[i]) != 2:
            print('Alice')
            exit()
    else:
        print('Bob')