n = int(input())

i_cs = {}
for i in range(n):
    i_cs[i] = []
for i in range(n-1):
    s, d = map(int, input().split())
    i_cs[s].append(d)
    i_cs[d].append(s)
# print(i_cs)

free_num = sum([1 for i, cs in i_cs.items() if len(cs) ==0])
# print(free_num)

one_num = sum([1 for i, cs in i_cs.items() if len(cs) == 1])

if free_num >= 2:
    print("Alice")
elif free_num == 1 and one_num >= 1:
    print("Alice")
else:
    print("Bob")