Why does the "or" function not work with InputBegan?

My script is pretty simple, i'm just trying to print something whenever i press either the W or the S key using the "or" function along with InputBegan, For some reason though, the code prints whenever i press any key on the keyboard not just W or S.

local W = Enum.KeyCode.W
local S = Enum.KeyCode.S

local UIS = game:GetService('UserInputService')

UIS.InputBegan:Connect(function(input)
	
	if input.KeyCode == W or S then
		print('working')
	end
	
end)

I really don't understand why it doesn't work when it seems like it should...