Why does the script activate when I press "L" while typing in chat?

So I have made this script that activates gates when the user presses "L" on their keyboard and overall it works but whenever they're typing in chat and happen to use the letter "L" the gates activate. Why does this happen and how do I fix this?

Script:

local UserInputService = game:GetService("UserInputService")
local Player = game.Players.LocalPlayer
local Character = Player.Character or Player.CharacterAdded:Wait()
local Mouse = Player:GetMouse()
local FirstEnabled = true
local SecondEnabled = false
local ThirdEnabled = false
local FourthGateEnabled = false
local FifthGateEnabled = false
local SixthGateEnabled = false 
local SeventhGateEnabled = false
local EighthGateEnabled = false
local WS = 20
local HS = 100

UserInputService.InputBegan:Connect(function(input)
    if input.KeyCode == Enum.KeyCode.L then 

        if FirstEnabled then 
        FirstEnabled = false 
        local OGWS = Player.Character.Humanoid.WalkSpeed 
        SecondEnabled = true 
        script.First:FireServer()
        spawn(function()
            wait(60)
            script.First:FireServer()
            FirstEnabled = true
            SecondEnabled = false
            ThirdEnabled = false
            FourthGateEnabled = false
            FifthGateEnabled = false
            SixthGateEnabled = false
            SeventhGateEnabled = false
            EighthGateEnabled = false
            Player.Character.Humanoid.WalkSpeed = WS
            Player.Character.Humanoid.MaxHealth = HS
        end)

        else if SecondEnabled then 
        ThirdEnabled = true 
        SecondEnabled = false
        script.Second:FireServer()
        spawn(function()
            wait(60)
            script.ddps:FireServer()
            FirstEnabled = true
            SecondEnabled = false
            ThirdEnabled = false
            FourthGateEnabled = false
            FifthGateEnabled = false
            SixthGateEnabled = false
            SeventhGateEnabled = false
            EighthGateEnabled = false 
                        Player.Character.Humanoid.WalkSpeed = WS
            Player.Character.Humanoid.MaxHealth = HS
        end)


        else if ThirdEnabled then 
        FourthGateEnabled = true 
        ThirdEnabled = false
        script.Third:FireServer()
                spawn(function()
            wait(60)
            script.ddps:FireServer()
            FirstEnabled = true
            SecondEnabled = false
            ThirdEnabled = false
            FourthGateEnabled = false
            FifthGateEnabled = false
            SixthGateEnabled = false
            SeventhGateEnabled = false
            EighthGateEnabled = false 
                        Player.Character.Humanoid.WalkSpeed = WS
            Player.Character.Humanoid.MaxHealth = HS 
        end)

        else if FourthGateEnabled then 
        FifthGateEnabled = true
        FourthGateEnabled = false
        script.Fourth:FireServer()
                spawn(function()
            wait(60)
            script.ddps:FireServer()
            FirstEnabled = true
            SecondEnabled = false
            ThirdEnabled = false
            FourthGateEnabled = false
            FifthGateEnabled = false
            SixthGateEnabled = false
            SeventhGateEnabled = false
            EighthGateEnabled = false 
                                    Player.Character.Humanoid.WalkSpeed = WS
            Player.Character.Humanoid.MaxHealth = HS 
        end)

        else if FifthGateEnabled then 
        SixthGateEnabled = true 
        FifthGateEnabled = false
        script.Fifth:FireServer()
                spawn(function()
            wait(60)
            script.ddps:FireServer()
            FirstEnabled = true
            SecondEnabled = false
            ThirdEnabled = false
            FourthGateEnabled = false
            FifthGateEnabled = false
            SixthGateEnabled = false
            SeventhGateEnabled = false
            EighthGateEnabled = false 
                                    Player.Character.Humanoid.WalkSpeed = WS
            Player.Character.Humanoid.MaxHealth = HS 
        end)

        else if SixthGateEnabled then 
        SeventhGateEnabled = true
        SixthGateEnabled = false 
        script.Sixth:FireServer()
                spawn(function()
            wait(60)
            script.ddps:FireServer()
            FirstEnabled = true
            SecondEnabled = false
            ThirdEnabled = false
            FourthGateEnabled = false
            FifthGateEnabled = false
            SixthGateEnabled = false
            SeventhGateEnabled = false
            EighthGateEnabled = false 
                                    Player.Character.Humanoid.WalkSpeed = WS
            Player.Character.Humanoid.MaxHealth = HS 
        end)

        else if SeventhGateEnabled then 
        EighthGateEnabled = true 
        SeventhGateEnabled = false 
        script.Seventh:FireServer()
                spawn(function()
            wait(60)
            script.ddps:FireServer()
            FirstEnabled = true
            SecondEnabled = false
            ThirdEnabled = false
            FourthGateEnabled = false
            FifthGateEnabled = false
            SixthGateEnabled = false
            SeventhGateEnabled = false
            EighthGateEnabled = false 
                                    Player.Character.Humanoid.WalkSpeed = WS
            Player.Character.Humanoid.MaxHealth = HS 
        end)

        else if EighthGateEnabled then
        EighthGateEnabled = false 
        script.Eighth:FireServer()
        spawn(function()
            wait(60)
            script.ddps:FireServer()
            FirstEnabled = true
            SecondEnabled = false
            ThirdEnabled = false
            FourthGateEnabled = false
            FifthGateEnabled = false
            SixthGateEnabled = false
            SeventhGateEnabled = false
            EighthGateEnabled = false 
                                    Player.Character.Humanoid.WalkSpeed = WS
            Player.Character.Humanoid.MaxHealth = HS 
        end)

                                    end
                                end
                            end
                        end
                    end
                end
            end
        end
    end
end)

GIF of what I mean if you're confused: https://gyazo.com/7db63d7d86068dd490ae401f39528da6