why does actionscript mess up strings

import flash.utils.Timer;

import flash.events.MouseEvent;

import flash.media.Sound;

import flash.media.SoundChannel;

var nCount: Number = 0;

var saying: String = (" welcome to the game");

var warning: String = (" Hurry 5 seconds till next question! ");

var ending: String = (" time has run out hope you had fun");

var score: Number = 0;

var answer: String = ("red square");

var answer2: String = ("blue polygon");

var answer3: String = ("green circle");

var answer4: String = ("gray triangle");

var userInput: String;

var shapes: Array = [sqr_mc, tri_mc, cir_mc, poly_mc];

var myTimer: Timer = new Timer(1000, nCount);

guess_txt.border = true;

var audio: Sound = new Mission();

var channel: SoundChannel = new SoundChannel();

timer_txt.text = nCount.toString();

myTimer.start();

timer_txt.border = true;

score_txt.border = true;

myTimer.addEventListener(TimerEvent.TIMER, count);

function count(e: TimerEvent): void {

  nCount++;

  timer_txt.text = ("Time:" + nCount.toString());

  if (nCount == 1) {

  response_txt.text = (saying);

  } else if (nCount == 5) {

  ques_txt.text = "What is color and shape shown ?";

  } else if (nCount == 10) {

  myTimer.stop();

  response_txt.text = (ending);

  channel.stop();

  }

}

guess_btn.addEventListener(MouseEvent.CLICK, testInput);

function testInput(e: MouseEvent) {

  userInput = guess_txt.text;

  if (userInput == answer || userInput == answer2 || userInput == answer3 || userInput == answer4) {

  response_txt.text = "correct";

  score += 10;

  score_txt.text = ("Score:" + score.toString());

  } else if (userInput != answer || userInput != answer2 || userInput != answer3 || userInput != answer4) {

  response_txt.text = "incorrect Try again. ";

  score -= 5;

  score_txt.text = (score.toString());

  }

}

reset_btn.addEventListener(MouseEvent.CLICK, resetGame);

function resetGame(e: MouseEvent) {

  nCount = 0;

  myTimer.reset();

  timer_txt.text = ("Time:" + nCount.toString());

  channel.stop();

  score = 0;

  score_txt.text = ("Score:" + score.toString());

}

play_btn.addEventListener(MouseEvent.CLICK, playGame);

function playGame(e: MouseEvent) {

  myTimer.start();

  timer_txt.text = ("Time:" + nCount.toString());

}

audio_btn.addEventListener(MouseEvent.CLICK, playAudio);

function playAudio(e: MouseEvent) {

  var audio: Sound = new Mission();

  var channel: SoundChannel = new SoundChannel();

  channel = audio.play()

}

i have that code and when i test my movie action script messes up the strings and only displays i o u and a's .. can any one help