Set textbox value if label text changes in iframe

<form>
<label>Link</label>
<input type="url" id="link" name="link" placeholder="drive.google.com/????" required class="form-control">
</form>

<iframe id="iupload" src="https://script.google.com/macros/s/AKfycbwzN_1XdItgP8HVTdRHg_Ex9UYdgW4d039V1ZCox2wcdygDEVQ/exec" style="border:none;" title="Upload Course Work"></iframe>

$(document).read(function(){
	var resp = $('iframe[name=iupload]').contents().find('#resp');
	$("resp").change(function(){
		var resptxt = $(this).text();
		$("#link").val(resptxt);
	});
});