Disable Sprite when keypress (Working Script, just need disble)

Hello guys!

I made this script and you are free to use it. When you press ,1,2,3 a sprite will display. What I need is when you press ,1,2,3 a sprite will disable and enable the other one. So it's like when you press 1, 1 will disable and enable 2 rather then just display sprites all in all when you press the buttons. Hope you can help! thanks. Here is the script.

 var Weapon1: Sprite;
 var Weapon2: Sprite;
 var Weapon3: Sprite;
 var Weapon4: Sprite;
 
 var sprite : SpriteRenderer;
 
 function Start ()
 {
     sprite = GetComponent(SpriteRenderer);
 }
 
 function Update ()
 {
     if(Input.GetKey(KeyCode.Alpha2))
     {
         sprite.sprite = Weapon1;
     }
 
     if(Input.GetKey(KeyCode.Alpha1))
     {
         sprite.sprite = Weapon2;
     }
     
         if(Input.GetKey(KeyCode.Alpha3))
     {
         sprite.sprite = Weapon3;
     }
     
             if(Input.GetKey(KeyCode.BackQuote))
     {
         sprite.sprite = Weapon4;
     }
 }