import sys
input=lambda: sys.stdin.readline().rstrip()
n=int(input())
par=[-1]*n

def find(x):
  if par[x]<0:
    return x
  else:
    par[x]=find(par[x])
    return par[x]

def unite(x,y):
  x=find(x)
  y=find(y)
  if x==y:
    return False
  else:
    if par[x]>par[y]:
      x,y=y,x
    par[x]+=par[y]
    par[y]=x
    return True

def same(x,y):
  return find(x)==find(y)

def size(x):
  return -par[find(x)]

for _ in range(n-1):
  u,v=map(int,input().split())
  unite(u,v)
for i in range(n):
  find(i)
if min(par)==-n:
  print("Bob")
else:
  print("Alice")