int main()
{  int q,m,n,i,j,a,b,k,u,flag,p=0;
   scanf("%d%d",&m,&n);
   for(q=m;q<=n;q++)
     {u=q;a=q/10;b=q%10;j=0;
       while(u>0)
         {j=j*10+b;
         b=a%10;
         a=a/10;
         u=u/10;}
    if(j==q)
    {flag=0;
        for(k=2;k<q/2;k++)
          {
          if(q%k==0) flag++;}
            if(flag==0) {printf("%d",q);p++;break;}}
           }
  for(i=q+1;i<=n;i++)
     {u=i;a=i/10;b=i%10;j=0;
       while(u>0)
         {j=j*10+b;
         b=a%10;
         a=a/10;
         u=u/10;}
    if(j==i)
    {flag=0;
        for(k=2;k<i/2;k++)
          {
          if(i%k==0) flag++;}
            if(flag==0) {printf(",%d",i);p++;}}
           }
           if(p==0) printf("no");
}
