int main()
{
	int m,n,i,j,h,g,sum,a,k,b[10];
	scanf("%d%d",&m,&n);
	for(k=0,i=m;i<=n;i++)
	{	for(j=2;j<=i/2;j++)
	{
		if((i%j)==0)
		{h=0;
		break;}
			h=1;
	}
     if (h==0)
		 continue;
	 for(g=i,sum=0;g>0;)
	 {  sum=10*sum;
		 a=g-(g/10)*10;
		 sum=sum+a;
		 g=g/10;
	 }
	 if(i!=sum)
		 continue;
		 b[k]=i;
		 k++;
	 
	}
	if(k==0)
		printf("no");
	else
	{for(i=0;i<=(k-2);i++)
		{	printf("%d,",b[i]);}
	printf("%d",b[k-1]);}

}