n = int(input())
x = []
y = []
for _ in range(n-1):
    a,b = map(int,input().split())
    x.append(a)
    y.append(b)
flag = 0
for i in range(n):
    if x.count(i) > 0 or y.count(i) > 0:
        continue
    else:
        flag = 1
        break
if flag == 1:
    print('Alice')
else:
    print('Bob')