Fatal error: Class 'controllers' not found

class C_mvc1 extends CI_Controller { 
       public function __construct(){
            parent::__construct();     
       }
 
      function index () {
               $this->load->model('M_mvc1','',TRUE);
               $data['$teks']=$this->M_mvc1->mHello();
               $this->load->view('V_mvc1',$data);
      }
}

class M-mvc1 extends CI_Model {
    function __construct(){
        parent::__construct();
    }
 
    function mHello(){
        return "hello word";
    }
}

class C_mvc1 extends Controller { // C na kapital n g pake akhiran s
      function C_mvc1 () {
               parent::Controller (); // yg ini jg
      }
 
      function index () {
               $this->load->model('M_mvc1','',TRUE);
               $data['$teks']=$this->M_mvc1->mHello();
               $this->load->view('V_mvc1',$data);
      }
}