#include <cstdio>

using namespace std;

const int N = 55;

int n, deg[N];

int main(){
	scanf("%d", &n);
	for(int i = 1;i < n;i++) {
		int a, b; scanf("%d%d", &a, &b);
		deg[a]++, deg[b]++;
	}
	int list = 0;
	for(int i = 1;i <= n;i++) list += deg[i] == 1;
	printf(((n - 1 - list) & 1) ? "Alice\n" : "Bob\n");
	return 0;
}