How to get Key with KeyCode.Question?

Hi, I'm working on a minigame but I can not get the key when the user presses "?" or "@", with the following code: if (Input.GetKeyDown("@")) { word+= "?"; } if (Input.GetKeyDown("@")) { word+= "@"; } if (Input.GetKeyDown(KeyCode.Question)) // i try too like this { word+= "?"; }