if (gameIsPlaying == false) {
        return;
    }

    if (isDead == true) {
        return;
    }
    if (isJumpingUp) {
        if (this.transform.position.x > JumpTargetLocation.x) {
            this.transform.position = new Vector3 (this.transform.position.x - (movingSpeed * Time.deltaTime), this.transform.position.y, this.transform.position.z);
            if (this.transform.position.x > midWayPointX) {
                this.transform.position = new Vector3 (this.transform.position.x, this.transform.position.y + jumpHeightIncrement * Time.deltaTime, this.transform.position.z);

            } else {
                this.transform.position = new Vector3 (this.transform.position.x, this.transform.position.y - jumpHeightIncrement * Time.deltaTime, this.transform.position.z);
            }

        } else {
            isJumpingUp = false;
            this.transform.position = new Vector3 (transform.position.x, initialPositionY, transform.position.z);
        }

    } else if (isJumpingDown) {
        if (this.transform.position.x < JumpTargetLocation.x) {
            this.transform.position = new Vector3 (this.transform.position.x + (movingSpeed * Time.deltaTime), this.transform.position.y, this.transform.position.z);
            if (this.transform.position.x < midWayPointX) {
                this.transform.position = new Vector3 (this.transform.position.x, this.transform.position.y + jumpHeightIncrement * Time.deltaTime, this.transform.position.z);

            } else {
                this.transform.position = new Vector3 (this.transform.position.x, this.transform.position.y - jumpHeightIncrement * Time.deltaTime, this.transform.position.z);
            }

        } else {
            isJumpingDown = false;
            this.transform.position = new Vector3 (transform.position.x, initialPositionY, transform.position.z);
        }

    } else if (isJumpingLeft) {
        if (this.transform.position.z > JumpTargetLocation.z) {
            this.transform.position = new Vector3 (this.transform.position.x, this.transform.position.y, this.transform.position.z - (movingSpeed * Time.deltaTime));
            if (this.transform.position.z > midWayPointX) {
                this.transform.position = new Vector3 (this.transform.position.x, this.transform.position.y + jumpHeightIncrement * Time.deltaTime, this.transform.position.z);
            } else {
                this.transform.position = new Vector3 (this.transform.position.x, this.transform.position.y - jumpHeightIncrement * Time.deltaTime, this.transform.position.z);
            }

        } else {
            isJumpingLeft = false;
            this.transform.position = new Vector3 (transform.position.x, initialPositionY, transform.position.z);
        }

    } else if (isJumpingRight) {
        if (this.transform.position.z < JumpTargetLocation.z) {
            this.transform.position = new Vector3 (this.transform.position.x, this.transform.position.y, this.transform.position.z + (movingSpeed * Time.deltaTime));
            if (this.transform.position.z < midWayPointX) {
                this.transform.position = new Vector3 (this.transform.position.x, this.transform.position.y + jumpHeightIncrement * Time.deltaTime, this.transform.position.z);
            } else {
                this.transform.position = new Vector3 (this.transform.position.x, this.transform.position.y - jumpHeightIncrement * Time.deltaTime, this.transform.position.z);
            }

        } else {
            isJumpingRight = false;
            this.transform.position = new Vector3 (transform.position.x, initialPositionY, transform.position.z);
        }
    }

    if (isPlayingDeathAnimation == true) {
        UpdateDeathAnimation();
    }


}


void SpawnNewStrip() {

    int stripsPrefabCount = poolOfStripsPrefabs.Length;
    int randomNumber = Random.Range (0, stripsPrefabCount);

    GameObject item = poolOfStripsPrefabs [randomNumber] as GameObject;

    Transform itemChildTransform = item.transform.GetChild(0) as Transform;
    Transform itemChildOfChildTranform = itemChildTransform.GetChild (0) as Transform;

    float itemWidth = itemChildOfChildTranform.gameObject.GetComponent<Renderer> ().bounds.size.x;

    GameObject lastStrip = strips [strips.Count - 1] as GameObject;

    GameObject newStrip = Instantiate (item, lastStrip.transform.position, lastStrip.transform.rotation) as GameObject;
    newStrip.transform.position = new Vector3 (newStrip.transform.position.x -  itemWidth, newStrip.transform.position.y, newStrip.transform.position.z);
    strips.Add (newStrip);
}

void OnTriggerEnter(Collider other){

    if (other.gameObject.tag == "Mail") {
        Debug.Log ("player take Mail");
        Score += 25;
        scoreText.text = "score; " + Score.ToString ();

        Destroy (other.gameObject);

        this.GetComponent<AudioSource> ().PlayOneShot (mailClip);
    }

    if (other.gameObject.tag == "Enemy") {
        Debug.Log ("player are dead");
        DeathAnimation();
    }

    if (other.gameObject.tag == "obstacle") {
        Debug.Log ("player hit obstacle");


        float offsetUpDown = 0;
        float offsetLeftRight = 0;

        if(isJumpingUp){
            offsetUpDown = 2.5f;
        }

        else if(isJumpingDown){
            offsetUpDown = -2.5f;
        }

        else if(isJumpingLeft){
            offsetLeftRight = 2.5f;
        }

        else if(isJumpingRight){
            offsetLeftRight = -2.5f;
        }


        transform.position = new Vector3(transform.position.x + offsetUpDown, initialPositionY, transform.position.z + offsetLeftRight);
        isJumpingUp = isJumpingRight = isJumpingLeft = isJumpingDown = false;
    }
}