def aa(m):
    c=[]
    while m!=uf[m]:
        c.append(m)
        m=uf[m]
    for i in c:
        uf[i]=m
    return m

n=int(input())
uf=[i for i in range(n)]
z=[0]*n
for i in range(n-1):
    a,b=map(int,input().split())
    uf[aa(a)]=aa(b)
    z[a]+=1;z[b]+=1
c=0
x=[0]*n
for i in range(n):
    x[aa(i)]+=1
d=1<<60
for i in x:
	if i:
		c+=1
		d=min(d,i)
if c==2 and d==1:
	s=1
	for i in range(n):
		if x[aa(i)]>=2 and z[i]!=2:
			s=0
	if s:
		c=1
		
if c==1:
    print("Bob")
else:
    print("Alice")