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)]
for i in range(n-1):
    a,b=map(int,input().split())
    uf[aa(a)]=aa(b)
c=0
for i in range(n):
    if i==aa(i):
        c+=1
if c==1:
    print("Bob")
else:
    print("Alice")