void main()
{
	int m,n,i1,i2=0,i3=0,mark1,mark2,len,mark3=0;
	int a[10];
	int k,x;
	scanf("%d %d",&m,&n);
	for(k=m;k<=n;k++)//??k?????????
	{

		mark1=1;
		mark2=1;
		for(i1=2;i1<k;i1++)
			if(k%i1==0){mark1=0;break;}
		if(mark1!=0)//?k???????k??????
		{
			x=k;
			i2=0;
			i3=0;
			while(x!=0) //?k???a[]???len?x=k,??while????k?????????k???????
			{
				a[i2]=x%10;
				x=x/10;
				i2++;
			}
			len=i2;
			for(;i3<i2;i3++,i2--)//?a[]????????????????????a??k?????
			{
				if(a[i2-1]!=a[i3])//??????mark2=0??
				{
					mark2=0;
					break;
				}
			}
			if(mark2==1)
			{
				if(mark3==0)//mark3=0:??????????????????
				{	for(i3=0;i3<len;i3++)
					printf("%d",a[i3]);
					mark3=1;//mark3=1:????????
				}
				else
				{
					printf(",");
					for(i3=0;i3<len;i3++)
					printf("%d",a[i3]);
				}
			}
		}
	}

	if(mark3==0)printf("no\n");
	else printf("\n");
}
