#pragma GCC optimize("Ofast")
#pragma GCC target("avx2")

char rbuf[1200000];
int ufb[100000];
int h[100000];

int uf(int i){ return ufb[i]>=0?ufb[i]=uf(ufb[i]):i; }

#define RD(v) for(v=0;c=*r++-48,c>=0;v=v*10+c)

main(){
	read(0,rbuf,sizeof rbuf);
	char*r=rbuf;
	int c;

	int n; RD(n);

	for(int i=0;i<n;++i){
		ufb[i]=-1;
	}

	int c1=0;
	int c2=n;
	while(--n){
		int u; RD(u);
		int v; RD(v);
		if(++h[u]==2) --c2;
		if(++h[v]==2) --c2;
		int ur=uf(u);
		int vr=uf(v);
		if(ur==vr){
			++c1;
		}else{
			if(ufb[ur]>ufb[vr]){
				ufb[vr]+=ufb[ur];
				ufb[ur]=vr;
			}else{
				ufb[ur]+=ufb[vr];
				ufb[vr]=ur;
			}
		}
	}

	if(c1==0||c1==1&&c2==1){
		write(1,"Bob",3);
	}else{
		write(1,"Alice",5);
	}
	_exit(0);
}