<!DOCTYPE html>
<html>
<head>
<style>
button { margin:4px; cursor:pointer; }
input { margin:4px; color:blue; }
</style>
<script src="http://code.jquery.com/jquery-1.9.1.js"></script>
</head>
<body>
<div>
<button>Feed</button>
<button>the</button>
<button>Input</button>
</div>
<input type="text" value="click a button" />
<script>
$("button").click(function () {
var text = $(this).text();
$("input").val(text);
});
</script>
</body>
</html>