jquery timepicker только цифры

$(function(){ 
   $('#example').timepicker({ 
        'timeFormat': 'h:i A', 
        dynamic: false, 
        dropdown: true, 
        scrollbar: true 
    }); 
});

<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script> 
<script src="http://jonthornton.github.io/jquery-timepicker/jquery.timepicker.js"></script> 
<link rel="stylesheet" href="http://jonthornton.github.io/jquery-timepicker/jquery.timepicker.css"> 
<input type="text" id="example" />