N = int(input())
u = [0] * (N-1)
v = [0] * (N-1)
for i in range(N-1):
    u[i],v[i] = list(map(int,input().split()))

tree = [[] for _ in range(N)]
union = [i for i in range(N)]

def get(i):
    if union[i] == i:
        return i
    else:
        return get(union[i])
def renketu(i,j):
    s = get(i)
    t = get(j)
    if s == t:
        return
    union[s] = t
    union[i] = t
    
for i in range(N-1):
    tree[u[i]].append(v[i])
    tree[v[i]].append(u[i])

    renketu(u[i],v[i])

cone = 0
for i in range(N):
    if union[i] == i:
        cone += 1
num = 0
for i in range(N):
    if len(tree[i]) == 1:
        num += 1

    
A = 'Alice'
B = 'Bob'
if cone == 1:
    print(B)
elif cone >= 3:
    print(A)
else:
    if num > 0:
        print(A)
    else:
        print(B)