script.js

$(document).ready(function(){
  
  var $randomnbr = $('.nbr');
  var $timer = 30;
  var $it;
  var $data = 0;
  var $index;
  var change;
  var letters = ["*","s","h","o","y","e","b", "*"];
  
  $randomnbr.each(function(){
    change = Math.round(Math.random() * 100);
    $(this).attr('data-change',change);
  });
  
  function random(){
    return Math.round(Math.random() * 9);
  }
  
  function select(){
    return Math.round(Math.random() * $randomnbr.length + 1);
  }
  
  function value(){
    $('.nbr:nth-child('+select()+')').html(''+random()+'');
    $('.nbr:nth-child('+select()+')').attr('data-number',$data);
    $data++;
    
    $randomnbr.each(function(){
      if(parseInt($(this).attr('data-number')) > parseInt($(this).attr('data-change'))){
        index = $('.ltr').index(this);
        $(this).html(letters[index]);
        $(this).removeClass('nbr');
      }
      console.log('hello world')
      
    });
  }
  
  $it = setInterval(value,$timer);
  
})