import std.stdio, std.conv, std.functional, std.string;
import std.algorithm, std.array, std.container, std.range, std.typecons;
import std.bigint, std.numeric, std.math, std.random;
import core.bitop;

string FMT_F = "%.10f";

static File _f;
void file_io(string fn) { _f = File(fn, "r"); }
static string[] s_rd;
T _RD(T = long)() { while(!s_rd.length) s_rd = readln.chomp.split; string res = s_rd[0]; s_rd.popFront; return res.to!T; }
T _RD(T = long)(File f) { while(!s_rd.length) s_rd = f.readln.chomp.split; string res = s_rd[0]; s_rd.popFront; return res.to!T; }
T[] _RDA(T = long)(T fix = 0) { auto r = readln.chomp.split.to!(T[]); r[] += fix; return r; }
T[] _RDA(T = long)(File f, T fix = 0) { auto r = f.readln.chomp.split.to!(T[]); r[] += fix; return r; }
T RD(T = long)() { if (_f.isOpen) return _RD!T(_f); else return _RD!T; }
T[] RDA(T = long)(T fix = 0) { if (_f.isOpen)  return _RDA!T(_f, fix); else return _RDA!T(fix); }

size_t[] MAKE_IDX(alias less = "a < b", Range)(Range range) { auto idx = new size_t[](range.length); makeIndex!(less)(range, idx); return idx;}
size_t MIN_POS(alias less = "a < b", Range)(Range range) { auto r = minPos!(less)(range); return range.length - r.length; }

void chmin(T)(ref T x, T y) { x = min(x, y); } void chmax(T)(ref T x, T y) { x = max(x, y); }
bool inside(T)(T x, T b, T e) { return x >= b && x < e; }
T lcm(T)(T x, T y) { return x * (y / gcd(x, y)); }

long mod = 10^^9 + 7;
//long mod = 998244353;
//long mod = 1_000_003;
void moda(T)(ref T x, T y) { x = (x + y) % mod; }
void mods(T)(ref T x, T y) { x = ((x + mod) - (y % mod)) % mod; }
void modm(T)(ref T x, T y) { x = (x * y) % mod; }
void modpow(T)(ref T x, T y) { if (!y) { x = 1; return; } auto t = x; x.modpow(y>>1); x.modm(x); if (y&1) x.modm(t); }

struct UnionFind
{
	void init(int n) { par = new int[](n); foreach (i; 0..n) par[i] = i; cnt = new int[](n); fill(cnt, 1); }
	int root(int i) { return par[i] == i ? i : (par[i] = root(par[i])); }
	bool same(int i, int j) { return root(i) == root(j); }
	void unite(int i, int j) { i = root(i); j = root(j); if (i == j) return; par[i] = j; cnt[j] += cnt[i]; }
	int size(int i) { return cnt[root(i)]; }
	int[] par, cnt;
}

void main()
{
	auto N = RD!int;
	auto edges = new int[][](N);
	UnionFind uf;
	uf.init(N);
	foreach (i; 0..N-1)
	{
		auto u = RD!int;
		auto v = RD!int;
		edges[u] ~= v;
		edges[v] ~= u;
		uf.unite(u, v);
	}

	bool[int] set;
	foreach (i; 0..N)
	{
		auto r = uf.root(cast(int)i);
		set[r] = true;
	}

	bool ans = set.keys.length >= 2;
	if (set.keys.length == 2)
	{
		int cnt;
		foreach (i; 0..N)
		{
			if (edges[i].length <= 1)
				++cnt;
		}
		if (cnt < 2)
		{
			ans = false;
		}
	}

	writeln(ans ? "Alice" : "Bob");
	stdout.flush;
	debug readln;
}