class UnionFind:
    def __init__(self, node):
        self.parent = [-1 for _ in range(node)]

    def find(self, target):
        if self.parent[target] < 0:
            return target
        else:
            self.parent[target] = self.find(self.parent[target])
            return self.parent[target]

    def is_same(self, x, y):
        return self.find(x) == self.find(y)

    def union(self, x, y):
        root_x = self.find(x)
        root_y = self.find(y)
        if root_x == root_y:
            return
        if self.parent[root_x] > self.parent[root_y]:
            root_x, root_y = root_y, root_x
        self.parent[root_x] += self.parent[root_y]
        self.parent[root_y] = root_x

    def get_size(self, x):
        return -self.parent[self.find(x)]


def main():
    islands = int(input())
    uf = UnionFind(islands)
    for _ in range(islands - 1):
        u, v = map(int, input().split())
        uf.union(u, v)
    print("Bob" if uf.get_size(0) == islands else "Alice")


if __name__ == '__main__':
    main()