class UnionFind:
    def __init__(self, n):
        self.par = [i for i in range(n+1)]
        self.rank = [0] * (n+1)
        self.size = [1 for _ in range(n+1)]
    # 検索
    def find(self, x):
        if self.par[x] == x:
            return x
        else:
            self.par[x] = self.find(self.par[x])
            return self.par[x]
    # 併合
    def union(self, x, y):
        x = self.find(x)
        y = self.find(y)
        if self.rank[x] < self.rank[y]:
            self.par[x] = y
            self.size[y] += self.size[x]
        else:
            self.par[y] = x
            self.size[x] += self.size[y]
        if self.rank[x] == self.rank[y]:
            self.rank[x] += 1
    # 同じ集合に属するか判定
    def same_check(self, x, y):
        return self.find(x) == self.find(y)

n = int(input())
uv = [[] for i in range(n)]
ki = UnionFind(n+1)
for i in range(n-1):
    u,v = map(int,input().split())
    uv[u].append(v)
    uv[v].append(u)
    if not ki.same_check(u,v):
        ki.union(u,v)

#idx = ki.find(0)
for i in range(n):
    if not ki.same_check(0,i):
    #if ki.find(i) != idx:
        print("Alice")
        exit()
print("Bob")