n = int(input())
b = [tuple(map(int, input().split())) for _ in range(n-1)]
l = list(range(n))
def f(u, d = 0): return (u, d) if l[u] == u else f(l[u], d+1)
c = [0] * n
r = n - 1
for u, v in b:
	c[u] += 1
	c[v] += 1
	u, d = f(u)
	v, e = f(v)
	if u == v: break
	if d < e: l[u] = v
	else: l[v] = u
	r -= 1
if 1 not in c: r -= 1
print("Alice" if r else "Bob")