package main

import (
	"fmt"
	"bufio"
	"os"
	"strconv"
)

//•*¨*•.¸¸♪I/O•*¨*•.¸¸♪

var (
	sc = bufio.NewScanner(os.Stdin)
	wr = bufio.NewWriter(os.Stdout)
)

func scanInt() int {
	sc.Scan()
	a,_ := strconv.Atoi(sc.Text())
	return a
}

func scanInt64() int64 {
	sc.Scan()
	a,_ := strconv.ParseInt(sc.Text(),10,64)
	return a
}

func scanFloat64() float64 {
	sc.Scan()
	a,_ := strconv.Atoi(sc.Text())
	return float64(a)
}

func scanInts(n int) []int {
	res := make([]int, n)
	for i := 0; i < n; i++ { res[i] = scanInt() }
	return res
}

func scanText() string {
	sc.Scan()
	return sc.Text()
}

func printInts(a ...int) {
	for i, e := range a {
		fmt.Fprint(wr, e)
		if i != len(a)-1 { fmt.Fprint(wr, " ") }
	}
	fmt.Fprintln(wr)
	wr.Flush()
}

//•*¨*•.¸¸♪Main•*¨*•.¸¸♪(　-ω-)ノ　(　・ω・)

func main() {
	sc.Split(bufio.ScanWords)
	// sc.Buffer(make([]byte, 10000), 100000000)

	n := scanInt()

	s := make([][]int, n)

	for i := 0; i < n-1; i++ {
		u,v := scanInt(),scanInt()
		s[u] = append(s[u],v)
		s[v] = append(s[v],u)
	}

	done := make([]bool, n)
	c := 0
	cyc := 0

	for i := 0; i < n; i++ {
		if done[i] {
			continue
		}
		queue := make([]int, 0)
		queue = append(queue,i)
		done[i] = true
		c++
		if c > 2 {
			fmt.Println("Alice")
			return
		}

		f := true

		for len(queue) != 0 {
			next := queue[0]
			if !(len(s[next]) == 2 || len(s[next]) == 0) {
				f = false
			}

			for _, e := range s[next] {
				if done[e] {
					continue
				}

				done[e] = true
				queue = append(queue, e)
			}
			queue = queue[1:]
		}

		if f {
			cyc++
		}

		if c == 2 && cyc != 2 {
			fmt.Println("Alice")
			return
		}
	}

	fmt.Println("Bob")

	// fmt.Println(c)
}