I need help to delete a Gui after I press a certain Button?

I'm Making a Pokémon RPG and I'd like to delete my gui I created after I pressed a certain Button. Much Appreciated if helped :) I was trying earlier to do : game.Lighting.One:Remove() But it only would kill the file location it wouldn't kill the gui on the screen

--onTouch Gui Shall Appear
local Gui = game.Lighting.One -

function GiveGui(Player)
if Player.PlayerGui:FindFirstChild(Gui.Name)~=nil then return end
Gui:Clone().Parent=Player.PlayerGui
end

script.Parent.Touched:connect(function(hit)

local Player=game.Players:GetPlayerFromCharacter(hit.Parent)
if Player==nil then return end
GiveGui(Player) 

end)
--if _ Keydown delete and create new Gui
pcall(game:GetService("UserInputService").InputBegan:connect(function(key)
if key.KeyCode == Enum.KeyCode.A then
    print 'the key A has been pressed'
    --THIS IS WHERE I WOULD DELETE MY GUI
else
    print 'Y u no press A?'
end
end))