public GameObject UpArrow;
	public GameObject DownArrow;
	public GameObject LeftArrow;
	public GameObject RightArrow;

	float randomNumber;

	// Use this for initialization
	void Start()
	{
	}

	// Update is called once per frame
	void Update()
	{
		if (Input.GetKeyDown (KeyCode.DownArrow)) {
			randomNumber = Random.Range (7f, -7f); // this means use a random number between 7f and 0f
			Instantiate (DownArrow, new Vector3 (randomNumber, 6f, -6f), Quaternion.identity);
		}
		if (Input.GetKeyDown (KeyCode.UpArrow)) {
			randomNumber = Random.Range (-7f, 7f);
			Instantiate (UpArrow, new Vector3 (randomNumber, -6f, 6f), Quaternion.identity);
		}
		if (Input.GetKeyDown (KeyCode.LeftArrow)) {
			randomNumber = Random.Range (7f, -7f);
			Instantiate (LeftArrow, new Vector3 (7f, randomNumber, -7f), Quaternion.identity);
		}
		if (Input.GetKeyDown (KeyCode.RightArrow)) {
			randomNumber = Random.Range (-7f, 7f);
			Instantiate (RightArrow, new Vector3 (-7f, randomNumber, -7f), Quaternion.identity);
		}
	}