var data = JSON.parse(req.responseText);
    var html = "<table border='5'>
    <tr>
    <th>n</th>
    <th>a</th>
    <th>s</th>
    <th>p</th>
    </tr>";

    for(k in data)
    {
       html += '<tr><td>' + data[k].n + '</td><td>' + data[k].a + '</td><td>' + data[k].s + '</td><td>' + data[k].p + '</td></tr>';
    }

    html += '</table>';

document.getElementById("txtHint").innerHTML = html;