from collections import Counter
N = int(input())
temp_dict = {}
for i in range(N):
    temp_dict[i] = 0

for i in range(N-1):
    a, b = list(map(int, input().split()))
    temp_dict[a] += 1
    temp_dict[b] += 1

count = Counter(temp_dict.values())
if 0 not in count:
    print("Bob")
elif count[0] == 1:
    if 1 not in count:
        print("Bob")
    else:
        print("Alice")
else:
    print("Alice")