void main()
{
  int m,n,x,i,r,y,k,s,c,time,t,haha;
  scanf("%d%d",&m,&n);
  c=0;
  
  for(x=m;x<=n;x++)
  {   
	  time=0;
      for(i=2;i<x;i++)
	  {
	     if(x%i!=0)
			 time=time+1;
		 else 
			 break;
	  }
	  
	  if(time==x-2) 
	  {   
		  y=0;
		  for(r=0;;r++)
		  {
			  haha=pow(10,r);//pow????????><.....???
			  if(x/haha==0)
				  break;
		  }
		  t=x;//?x???t?????x?m?n??????x???????????????????~
		  for(k=1;k<=r;k++)//?????????~?????????~
		  {
			  s=t%10;
			  t=t/10;
			  y=10*y+s;
		  }
		  if(x==y)
		  {
			  c=c+1 ;
		    if(c==1)  //????????????????????c??????~~
				printf("%d",x);
			if(c>1)
			    printf(",%d",x);	
		  }
	  }
  }
  if(c==0)
		  printf("no");
}