#include <iostream>
#include <math.h>
 
using namespace std;
 
long long	int gcd(long long int a, long long int b) {
    return b == 0 ? a : gcd(b, a % b);
}
 
 
int main() {
 
 
 
	long long int l,r;
	cin>>l>>r;
	 if(l+1==(r)){
	 cout<<-1;
	 return 0;}
 
//cout<<l<<" "<<l+1<<" ";
 
long long 	int q1=l , w2=l+1;
//cout<<q1<<" "<<w2;
	for(long long int i=l+2;i<=r;++i){
//	cout <<i;
	if(	gcd(i,w2)==1 && 	gcd(i,q1)>1  )	{cout<<i<<endl; break;	}
	//	cout <<gcd(i,q)<<" "<<	gcd(i,w)<<endl;
	}
 
	for(int i=2;i<sqrt(q1);++i)
	if(q1%i==0)
	cout<<i<<" ";
	return 0;
}

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NjQwIDY0MA==

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