void main()
{
	int m,n,i,j,k,re,num,p;
	int b[500];
	scanf("%d%d",&m,&n);
	k=0;
	for (i=m;i<=n;i++)
	{
		num=i;
		re=0;
		while (i>0)
		{
			p=i%10;
			re=re*10+p;
			i=i/10;
		}
		i=num;
		if (re==num)
		{
			for (j=2;j<=sqrt(num);j++)
			{
				if (num%j==0)
					break;
			}
			if (j>sqrt(num))
			{
				b[k]=num;
				k++;
			}
		}
	}
	if (k==0)
		printf("no\n");
	else
	{
		for (i=0;i<k-1;i++)
			printf("%d,",b[i]);
		printf("%d\n",b[k-1]);
	}
}