Help with rotation please

Hi guys, I have a character that can walk however, he cannot look sideways then walk. So I decided to rotate him and depending on a button. My plan is that when a user press 'A' he would rotate to the left and then when they press w he start walking to the left. Now when they release these two buttons he would go back to his normal position. Below is my code and it works; however, if I keep pressing 'A' he would just keep adjusting his rotation and his rotation wouldn't be fixed to 183. So please can you view my code and just tell me what is wrong with it. Thank you!

 void Update()
         {
             if (Input.GetKey(KeyCode.W)) // This is to check if the key 'W' is pressed and it works
             {
                 anime.Play("walk", -1); //this is to play the animation and it works
             }
             if (Input.GetKeyDown(KeyCode.W & KeyCode.A)) //here is the problem
             {
                 anime.Play("walk", -1);//here is the problem
                 transform.Rotate(0, 183, 0);//here is the problem
             }      
             }
     
         }