const TAKANA: bool = true;

fn main() {
	proconio::input! {
		N: usize,
		edges: [(usize, usize); N - 1],
	}
	
	let mut graph = vec![vec![]; N];
	for &(u, v) in &edges {
		graph[u].push(v);
		graph[v].push(u);
	}
	
	let mut visited = vec![false; N];
	let mut stack = vec![];
	for s in 0 .. N {
		if visited[s] == TAKANA {
			continue;
		}
		let mut size = 0;
		visited[s] = TAKANA;
		stack.push(s);
		while let Some(u) = stack.pop() {
			size += 1;
			for &v in &graph[u] {
				if visited[v] == TAKANA {
					continue;	
				}
				// 歩いた跡に高菜を生やしていく
				visited[v] = TAKANA;
				stack.push(v);
			}
		}
		if size <= 2 {
			println!("Alice");
			return;
		}
	}
	println!("Bob");
}