void main()
{int a,b,c;
int m,n,k=0;
int i;
int sushu(int x);
scanf("%d  %d",&m,&n);
i=m;
    for(;i<=n;i++)
	{  b=i;
	   c=0;
       while(b!=0)
	   {c=c*10+b%10;
	    b=b/10;
	   }
	   if((c==i)&&(sushu(c)==1))
{if(k==0){printf("%d",c);k=1;}
else printf(",%d",c);}
	  	}if(k==0) 
printf("no");
}



int sushu(int x)  
  {
	  int t=0;  
	  int z;
        z=2;
	for(;z<=(x/2);z++)
	{if(x%z==0)break;
	 else if(z==(x/2))t=1;
	}
	return(t);
  } 