import sys
read = sys.stdin.buffer.read
readline = sys.stdin.buffer.readline
readlines = sys.stdin.buffer.readlines

N = int(readline())
m = map(int,read().split())
UV = zip(m,m)

graph = [[] for _ in range(N)]
for u,v in UV:
    graph[u].append(v)
    graph[v].append(u)

comp = [0] * N
c = 0
for v in range(N):
    if comp[v]:
        continue
    c += 1
    comp[v] = c
    stack = [v]
    while stack:
        v = stack.pop()
        for w in graph[v]:
            if comp[w]:
                continue
            comp[w] = c
            stack.append(w)

n = max(comp)
if n >= 3:
    print('Alice')
    exit()
if n == 1:
    print('Bob')
    exit()

deg = [len(x) for x in graph]
if any(x == 1 for x in deg):
    print('Alice')
else:
    print('Bob')