Edit in JSFiddle

$(document).ready(function(){
   var table = $('#example').DataTable({
      ajax: 'https://gyrocode.github.io/files/jquery-datatables/arrays.json',
      dom: "A<'row'<'col-sm-6'l><'col-sm-6'f>>" +
           "<'row'<'col-sm-12'tr>>" +
           "<'row'<'col-sm-5'i><'col-sm-7'p>>",     
      alphabetSearch: {
         column: 0
      },
      drawCallback: function(){
         $('.alphabet ul').addClass('pagination pagination-sm');
         $('.alphabet .alphabet-info-display').addClass('form-control-static');
         $('.alphabet a.active').closest('li').addClass('active');
      }
   });
});

<div class="container-fluid">

<h3><a target="_blank" href="https://www.gyrocode.com/projects/jquery-datatables-alphabetsearch/">jQuery DataTables AlphabetSearch:</a> <a target="_blank" href="https://www.gyrocode.com/projects/jquery-datatables-alphabetsearch/examples/styling/bootstrap3/">Bootstrap 3</a></h3>
    
<table id="example" class="table table-bordered table-striped table-condensed" cellspacing="0" width="100%">
   <thead>
      <tr>
         <th>Name</th>
         <th>Position</th>
         <th>Office</th>
         <th>Extn</th>
         <th>Start date</th>
         <th>Salary</th>
      </tr>
   </thead>
   <tfoot>
      <tr>
         <th>Name</th>
         <th>Position</th>
         <th>Office</th>
         <th>Age</th>
         <th>Start date</th>
         <th>Salary</th>
      </tr>
   </tfoot>
</table>

<hr><a target="_blank" href="https://www.gyrocode.com/projects/jquery-datatables-alphabetical-search/">See full article on Gyrocode.com</a>

</div>