class UnionFind:
    def __init__(self, n):
        self.parent = [-1] * n
        self.cnt = n

    def root(self, x):
        """頂点xの根を求める"""
        if self.parent[x] < 0:
            return x
        else:
            self.parent[x] = self.root(self.parent[x])
            return self.parent[x]

    def merge(self, x, y):
        """頂点xを含む集合と頂点y含む集合を結合する"""
        x = self.root(x)
        y = self.root(y)
        if x != y:
            if self.parent[x] > self.parent[y]:
                x, y = y, x
            self.parent[x] += self.parent[y]
            self.parent[y] = x
            self.cnt -= 1

    def is_same(self, x, y):
        """頂点xと頂点yが同じ集合に属するかどうかを返す"""
        return self.root(x) == self.root(y) 
    
    def get_size(self, x):
        """頂点xを含む集合の要素数を返す"""
        return -self.parent[self.root(x)]
    
    def get_cnt(self):
        """木の個数を返す"""
        return self.cnt

n = int(input())
info = [list(map(int, input().split())) for i in range(n - 1)]

uf = UnionFind(n)
for i in range(n - 1):
    a, b = info[i]
    uf.merge(a, b)

if uf.get_cnt() == 1:
    print("Bob")
else:
    print("Alice")