code doesn't work

i put following code in as3 when type in input letter "a" doesn't go frame 3.

enter.addeventlistener (mouseevent.click,nf);

function nf (event:mouseevent) :void {

if (ntext.text == "a") {

  gotoandstop(3);

}

else {

  error.text = "x";

}

}

did click enter?

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